Research and analysis
D6ai: Relative abundance of priority species in England, 1970 to 2023
Updated 1 December 2025
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| year | trendline | value |
|---|---|---|
| 1970 | Smoothed index (option 1) | 100.0 |
| 1971 | Smoothed index (option 1) | 92.2 |
| 1972 | Smoothed index (option 1) | 86.1 |
| 1973 | Smoothed index (option 1) | 81.3 |
| 1974 | Smoothed index (option 1) | 77.5 |
| 1975 | Smoothed index (option 1) | 74.4 |
| 1976 | Smoothed index (option 1) | 71.9 |
| 1977 | Smoothed index (option 1) | 69.9 |
| 1978 | Smoothed index (option 1) | 68.1 |
| 1979 | Smoothed index (option 1) | 66.6 |
| 1980 | Smoothed index (option 1) | 65.1 |
| 1981 | Smoothed index (option 1) | 63.7 |
| 1982 | Smoothed index (option 1) | 62.2 |
| 1983 | Smoothed index (option 1) | 60.6 |
| 1984 | Smoothed index (option 1) | 58.9 |
| 1985 | Smoothed index (option 1) | 57.1 |
| 1986 | Smoothed index (option 1) | 55.0 |
| 1987 | Smoothed index (option 1) | 52.9 |
| 1988 | Smoothed index (option 1) | 50.6 |
| 1989 | Smoothed index (option 1) | 48.3 |
| 1990 | Smoothed index (option 1) | 45.9 |
| 1991 | Smoothed index (option 1) | 43.5 |
| 1992 | Smoothed index (option 1) | 41.2 |
| 1993 | Smoothed index (option 1) | 38.9 |
| 1994 | Smoothed index (option 1) | 36.8 |
| 1995 | Smoothed index (option 1) | 34.8 |
| 1996 | Smoothed index (option 1) | 32.9 |
| 1997 | Smoothed index (option 1) | 31.2 |
| 1998 | Smoothed index (option 1) | 29.7 |
| 1999 | Smoothed index (option 1) | 28.5 |
| 2000 | Smoothed index (option 1) | 27.4 |
| 2001 | Smoothed index (option 1) | 26.6 |
| 2002 | Smoothed index (option 1) | 26.0 |
| 2003 | Smoothed index (option 1) | 25.5 |
| 2004 | Smoothed index (option 1) | 25.2 |
| 2005 | Smoothed index (option 1) | 25.1 |
| 2006 | Smoothed index (option 1) | 25.0 |
| 2007 | Smoothed index (option 1) | 25.1 |
| 2008 | Smoothed index (option 1) | 25.1 |
| 2009 | Smoothed index (option 1) | 25.2 |
| 2010 | Smoothed index (option 1) | 25.3 |
| 2011 | Smoothed index (option 1) | 25.3 |
| 2012 | Smoothed index (option 1) | 25.3 |
| 2013 | Smoothed index (option 1) | 25.3 |
| 2014 | Smoothed index (option 1) | 25.2 |
| 2015 | Smoothed index (option 1) | 25.0 |
| 2016 | Smoothed index (option 1) | 24.8 |
| 2017 | Smoothed index (option 1) | 24.6 |
| 2018 | Smoothed index (option 1) | 24.3 |
| 2019 | Smoothed index (option 1) | 24.0 |
| 2020 | Smoothed index (option 1) | 23.8 |
| 2021 | Smoothed index (option 1) | 23.5 |
| 2022 | Smoothed index (option 1) | 23.2 |
| 2023 | Smoothed index (option 1) | 22.9 |
| 1970 | 95% credible interval lower bound (option 1) | 100.0 |
| 1971 | 95% credible interval lower bound (option 1) | 90.3 |
| 1972 | 95% credible interval lower bound (option 1) | 82.8 |
| 1973 | 95% credible interval lower bound (option 1) | 77.1 |
| 1974 | 95% credible interval lower bound (option 1) | 72.7 |
| 1975 | 95% credible interval lower bound (option 1) | 69.2 |
| 1976 | 95% credible interval lower bound (option 1) | 66.5 |
| 1977 | 95% credible interval lower bound (option 1) | 64.3 |
| 1978 | 95% credible interval lower bound (option 1) | 62.5 |
| 1979 | 95% credible interval lower bound (option 1) | 60.7 |
| 1980 | 95% credible interval lower bound (option 1) | 59.0 |
| 1981 | 95% credible interval lower bound (option 1) | 57.4 |
| 1982 | 95% credible interval lower bound (option 1) | 55.7 |
| 1983 | 95% credible interval lower bound (option 1) | 54.2 |
| 1984 | 95% credible interval lower bound (option 1) | 52.4 |
| 1985 | 95% credible interval lower bound (option 1) | 50.6 |
| 1986 | 95% credible interval lower bound (option 1) | 48.6 |
| 1987 | 95% credible interval lower bound (option 1) | 46.6 |
| 1988 | 95% credible interval lower bound (option 1) | 44.4 |
| 1989 | 95% credible interval lower bound (option 1) | 42.3 |
| 1990 | 95% credible interval lower bound (option 1) | 40.1 |
| 1991 | 95% credible interval lower bound (option 1) | 38.0 |
| 1992 | 95% credible interval lower bound (option 1) | 35.9 |
| 1993 | 95% credible interval lower bound (option 1) | 33.8 |
| 1994 | 95% credible interval lower bound (option 1) | 31.8 |
| 1995 | 95% credible interval lower bound (option 1) | 30.0 |
| 1996 | 95% credible interval lower bound (option 1) | 28.3 |
| 1997 | 95% credible interval lower bound (option 1) | 26.8 |
| 1998 | 95% credible interval lower bound (option 1) | 25.5 |
| 1999 | 95% credible interval lower bound (option 1) | 24.4 |
| 2000 | 95% credible interval lower bound (option 1) | 23.5 |
| 2001 | 95% credible interval lower bound (option 1) | 22.7 |
| 2002 | 95% credible interval lower bound (option 1) | 22.1 |
| 2003 | 95% credible interval lower bound (option 1) | 21.7 |
| 2004 | 95% credible interval lower bound (option 1) | 21.5 |
| 2005 | 95% credible interval lower bound (option 1) | 21.3 |
| 2006 | 95% credible interval lower bound (option 1) | 21.3 |
| 2007 | 95% credible interval lower bound (option 1) | 21.2 |
| 2008 | 95% credible interval lower bound (option 1) | 21.2 |
| 2009 | 95% credible interval lower bound (option 1) | 21.2 |
| 2010 | 95% credible interval lower bound (option 1) | 21.3 |
| 2011 | 95% credible interval lower bound (option 1) | 21.2 |
| 2012 | 95% credible interval lower bound (option 1) | 21.2 |
| 2013 | 95% credible interval lower bound (option 1) | 21.1 |
| 2014 | 95% credible interval lower bound (option 1) | 20.9 |
| 2015 | 95% credible interval lower bound (option 1) | 20.8 |
| 2016 | 95% credible interval lower bound (option 1) | 20.6 |
| 2017 | 95% credible interval lower bound (option 1) | 20.4 |
| 2018 | 95% credible interval lower bound (option 1) | 20.1 |
| 2019 | 95% credible interval lower bound (option 1) | 19.8 |
| 2020 | 95% credible interval lower bound (option 1) | 19.5 |
| 2021 | 95% credible interval lower bound (option 1) | 19.3 |
| 2022 | 95% credible interval lower bound (option 1) | 19.0 |
| 2023 | 95% credible interval lower bound (option 1) | 18.7 |
| 1970 | 95% credible interval upper bound (option 1) | 100.0 |
| 1971 | 95% credible interval upper bound (option 1) | 94.3 |
| 1972 | 95% credible interval upper bound (option 1) | 89.5 |
| 1973 | 95% credible interval upper bound (option 1) | 85.7 |
| 1974 | 95% credible interval upper bound (option 1) | 82.3 |
| 1975 | 95% credible interval upper bound (option 1) | 79.8 |
| 1976 | 95% credible interval upper bound (option 1) | 77.5 |
| 1977 | 95% credible interval upper bound (option 1) | 75.7 |
| 1978 | 95% credible interval upper bound (option 1) | 74.1 |
| 1979 | 95% credible interval upper bound (option 1) | 72.8 |
| 1980 | 95% credible interval upper bound (option 1) | 71.7 |
| 1981 | 95% credible interval upper bound (option 1) | 70.4 |
| 1982 | 95% credible interval upper bound (option 1) | 69.3 |
| 1983 | 95% credible interval upper bound (option 1) | 67.8 |
| 1984 | 95% credible interval upper bound (option 1) | 66.1 |
| 1985 | 95% credible interval upper bound (option 1) | 64.3 |
| 1986 | 95% credible interval upper bound (option 1) | 62.3 |
| 1987 | 95% credible interval upper bound (option 1) | 59.9 |
| 1988 | 95% credible interval upper bound (option 1) | 57.5 |
| 1989 | 95% credible interval upper bound (option 1) | 55.1 |
| 1990 | 95% credible interval upper bound (option 1) | 52.6 |
| 1991 | 95% credible interval upper bound (option 1) | 50.1 |
| 1992 | 95% credible interval upper bound (option 1) | 47.6 |
| 1993 | 95% credible interval upper bound (option 1) | 45.1 |
| 1994 | 95% credible interval upper bound (option 1) | 42.7 |
| 1995 | 95% credible interval upper bound (option 1) | 40.5 |
| 1996 | 95% credible interval upper bound (option 1) | 38.4 |
| 1997 | 95% credible interval upper bound (option 1) | 36.5 |
| 1998 | 95% credible interval upper bound (option 1) | 34.8 |
| 1999 | 95% credible interval upper bound (option 1) | 33.5 |
| 2000 | 95% credible interval upper bound (option 1) | 32.3 |
| 2001 | 95% credible interval upper bound (option 1) | 31.3 |
| 2002 | 95% credible interval upper bound (option 1) | 30.7 |
| 2003 | 95% credible interval upper bound (option 1) | 30.3 |
| 2004 | 95% credible interval upper bound (option 1) | 29.9 |
| 2005 | 95% credible interval upper bound (option 1) | 29.7 |
| 2006 | 95% credible interval upper bound (option 1) | 29.8 |
| 2007 | 95% credible interval upper bound (option 1) | 29.8 |
| 2008 | 95% credible interval upper bound (option 1) | 29.9 |
| 2009 | 95% credible interval upper bound (option 1) | 30.2 |
| 2010 | 95% credible interval upper bound (option 1) | 30.3 |
| 2011 | 95% credible interval upper bound (option 1) | 30.3 |
| 2012 | 95% credible interval upper bound (option 1) | 30.3 |
| 2013 | 95% credible interval upper bound (option 1) | 30.3 |
| 2014 | 95% credible interval upper bound (option 1) | 30.2 |
| 2015 | 95% credible interval upper bound (option 1) | 30.0 |
| 2016 | 95% credible interval upper bound (option 1) | 29.9 |
| 2017 | 95% credible interval upper bound (option 1) | 29.6 |
| 2018 | 95% credible interval upper bound (option 1) | 29.4 |
| 2019 | 95% credible interval upper bound (option 1) | 29.2 |
| 2020 | 95% credible interval upper bound (option 1) | 28.9 |
| 2021 | 95% credible interval upper bound (option 1) | 28.6 |
| 2022 | 95% credible interval upper bound (option 1) | 28.2 |
| 2023 | 95% credible interval upper bound (option 1) | 27.8 |
| 1970 | Smoothed index (option 2) | 100.0 |
| 1971 | Smoothed index (option 2) | 89.7 |
| 1972 | Smoothed index (option 2) | 83.0 |
| 1973 | Smoothed index (option 2) | 78.7 |
| 1974 | Smoothed index (option 2) | 76.3 |
| 1975 | Smoothed index (option 2) | 75.2 |
| 1976 | Smoothed index (option 2) | 74.6 |
| 1977 | Smoothed index (option 2) | 73.4 |
| 1978 | Smoothed index (option 2) | 71.0 |
| 1979 | Smoothed index (option 2) | 67.8 |
| 1980 | Smoothed index (option 2) | 64.8 |
| 1981 | Smoothed index (option 2) | 62.9 |
| 1982 | Smoothed index (option 2) | 61.9 |
| 1983 | Smoothed index (option 2) | 60.9 |
| 1984 | Smoothed index (option 2) | 59.4 |
| 1985 | Smoothed index (option 2) | 57.2 |
| 1986 | Smoothed index (option 2) | 54.8 |
| 1987 | Smoothed index (option 2) | 52.2 |
| 1988 | Smoothed index (option 2) | 49.9 |
| 1989 | Smoothed index (option 2) | 47.8 |
| 1990 | Smoothed index (option 2) | 46.0 |
| 1991 | Smoothed index (option 2) | 44.2 |
| 1992 | Smoothed index (option 2) | 42.3 |
| 1993 | Smoothed index (option 2) | 40.2 |
| 1994 | Smoothed index (option 2) | 38.0 |
| 1995 | Smoothed index (option 2) | 35.6 |
| 1996 | Smoothed index (option 2) | 33.0 |
| 1997 | Smoothed index (option 2) | 30.4 |
| 1998 | Smoothed index (option 2) | 28.0 |
| 1999 | Smoothed index (option 2) | 26.2 |
| 2000 | Smoothed index (option 2) | 25.4 |
| 2001 | Smoothed index (option 2) | 25.5 |
| 2002 | Smoothed index (option 2) | 26.2 |
| 2003 | Smoothed index (option 2) | 26.6 |
| 2004 | Smoothed index (option 2) | 26.5 |
| 2005 | Smoothed index (option 2) | 26.0 |
| 2006 | Smoothed index (option 2) | 25.2 |
| 2007 | Smoothed index (option 2) | 24.7 |
| 2008 | Smoothed index (option 2) | 24.7 |
| 2009 | Smoothed index (option 2) | 25.3 |
| 2010 | Smoothed index (option 2) | 26.1 |
| 2011 | Smoothed index (option 2) | 26.5 |
| 2012 | Smoothed index (option 2) | 26.1 |
| 2013 | Smoothed index (option 2) | 25.2 |
| 2014 | Smoothed index (option 2) | 24.2 |
| 2015 | Smoothed index (option 2) | 23.5 |
| 2016 | Smoothed index (option 2) | 23.3 |
| 2017 | Smoothed index (option 2) | 23.3 |
| 2018 | Smoothed index (option 2) | 23.6 |
| 2019 | Smoothed index (option 2) | 24.0 |
| 2020 | Smoothed index (option 2) | 24.1 |
| 2021 | Smoothed index (option 2) | 24.0 |
| 2022 | Smoothed index (option 2) | 23.5 |
| 2023 | Smoothed index (option 2) | 22.7 |
| 1970 | 95% credible interval lower bound (option 2) | 100.0 |
| 1971 | 95% credible interval lower bound (option 2) | 87.4 |
| 1972 | 95% credible interval lower bound (option 2) | 79.6 |
| 1973 | 95% credible interval lower bound (option 2) | 74.7 |
| 1974 | 95% credible interval lower bound (option 2) | 71.9 |
| 1975 | 95% credible interval lower bound (option 2) | 70.2 |
| 1976 | 95% credible interval lower bound (option 2) | 69.0 |
| 1977 | 95% credible interval lower bound (option 2) | 67.3 |
| 1978 | 95% credible interval lower bound (option 2) | 64.7 |
| 1979 | 95% credible interval lower bound (option 2) | 61.5 |
| 1980 | 95% credible interval lower bound (option 2) | 58.6 |
| 1981 | 95% credible interval lower bound (option 2) | 56.6 |
| 1982 | 95% credible interval lower bound (option 2) | 55.6 |
| 1983 | 95% credible interval lower bound (option 2) | 54.5 |
| 1984 | 95% credible interval lower bound (option 2) | 52.9 |
| 1985 | 95% credible interval lower bound (option 2) | 50.7 |
| 1986 | 95% credible interval lower bound (option 2) | 48.3 |
| 1987 | 95% credible interval lower bound (option 2) | 46.0 |
| 1988 | 95% credible interval lower bound (option 2) | 43.8 |
| 1989 | 95% credible interval lower bound (option 2) | 41.7 |
| 1990 | 95% credible interval lower bound (option 2) | 39.9 |
| 1991 | 95% credible interval lower bound (option 2) | 38.2 |
| 1992 | 95% credible interval lower bound (option 2) | 36.5 |
| 1993 | 95% credible interval lower bound (option 2) | 34.5 |
| 1994 | 95% credible interval lower bound (option 2) | 32.5 |
| 1995 | 95% credible interval lower bound (option 2) | 30.4 |
| 1996 | 95% credible interval lower bound (option 2) | 28.0 |
| 1997 | 95% credible interval lower bound (option 2) | 25.7 |
| 1998 | 95% credible interval lower bound (option 2) | 23.7 |
| 1999 | 95% credible interval lower bound (option 2) | 22.1 |
| 2000 | 95% credible interval lower bound (option 2) | 21.4 |
| 2001 | 95% credible interval lower bound (option 2) | 21.5 |
| 2002 | 95% credible interval lower bound (option 2) | 22.0 |
| 2003 | 95% credible interval lower bound (option 2) | 22.4 |
| 2004 | 95% credible interval lower bound (option 2) | 22.2 |
| 2005 | 95% credible interval lower bound (option 2) | 21.8 |
| 2006 | 95% credible interval lower bound (option 2) | 21.1 |
| 2007 | 95% credible interval lower bound (option 2) | 20.6 |
| 2008 | 95% credible interval lower bound (option 2) | 20.6 |
| 2009 | 95% credible interval lower bound (option 2) | 21.1 |
| 2010 | 95% credible interval lower bound (option 2) | 21.8 |
| 2011 | 95% credible interval lower bound (option 2) | 22.1 |
| 2012 | 95% credible interval lower bound (option 2) | 21.7 |
| 2013 | 95% credible interval lower bound (option 2) | 21.0 |
| 2014 | 95% credible interval lower bound (option 2) | 20.2 |
| 2015 | 95% credible interval lower bound (option 2) | 19.5 |
| 2016 | 95% credible interval lower bound (option 2) | 19.3 |
| 2017 | 95% credible interval lower bound (option 2) | 19.3 |
| 2018 | 95% credible interval lower bound (option 2) | 19.5 |
| 2019 | 95% credible interval lower bound (option 2) | 19.8 |
| 2020 | 95% credible interval lower bound (option 2) | 19.9 |
| 2021 | 95% credible interval lower bound (option 2) | 19.8 |
| 2022 | 95% credible interval lower bound (option 2) | 19.3 |
| 2023 | 95% credible interval lower bound (option 2) | 18.5 |
| 1970 | 95% credible interval upper bound (option 2) | 100.0 |
| 1971 | 95% credible interval upper bound (option 2) | 92.0 |
| 1972 | 95% credible interval upper bound (option 2) | 86.5 |
| 1973 | 95% credible interval upper bound (option 2) | 83.2 |
| 1974 | 95% credible interval upper bound (option 2) | 81.3 |
| 1975 | 95% credible interval upper bound (option 2) | 80.8 |
| 1976 | 95% credible interval upper bound (option 2) | 80.5 |
| 1977 | 95% credible interval upper bound (option 2) | 79.9 |
| 1978 | 95% credible interval upper bound (option 2) | 77.6 |
| 1979 | 95% credible interval upper bound (option 2) | 74.6 |
| 1980 | 95% credible interval upper bound (option 2) | 71.8 |
| 1981 | 95% credible interval upper bound (option 2) | 70.0 |
| 1982 | 95% credible interval upper bound (option 2) | 69.2 |
| 1983 | 95% credible interval upper bound (option 2) | 68.5 |
| 1984 | 95% credible interval upper bound (option 2) | 66.8 |
| 1985 | 95% credible interval upper bound (option 2) | 64.5 |
| 1986 | 95% credible interval upper bound (option 2) | 61.9 |
| 1987 | 95% credible interval upper bound (option 2) | 59.3 |
| 1988 | 95% credible interval upper bound (option 2) | 56.9 |
| 1989 | 95% credible interval upper bound (option 2) | 54.8 |
| 1990 | 95% credible interval upper bound (option 2) | 53.0 |
| 1991 | 95% credible interval upper bound (option 2) | 51.0 |
| 1992 | 95% credible interval upper bound (option 2) | 49.1 |
| 1993 | 95% credible interval upper bound (option 2) | 47.0 |
| 1994 | 95% credible interval upper bound (option 2) | 44.6 |
| 1995 | 95% credible interval upper bound (option 2) | 41.9 |
| 1996 | 95% credible interval upper bound (option 2) | 38.9 |
| 1997 | 95% credible interval upper bound (option 2) | 35.9 |
| 1998 | 95% credible interval upper bound (option 2) | 33.1 |
| 1999 | 95% credible interval upper bound (option 2) | 31.0 |
| 2000 | 95% credible interval upper bound (option 2) | 30.2 |
| 2001 | 95% credible interval upper bound (option 2) | 30.4 |
| 2002 | 95% credible interval upper bound (option 2) | 31.2 |
| 2003 | 95% credible interval upper bound (option 2) | 32.0 |
| 2004 | 95% credible interval upper bound (option 2) | 31.8 |
| 2005 | 95% credible interval upper bound (option 2) | 31.1 |
| 2006 | 95% credible interval upper bound (option 2) | 30.2 |
| 2007 | 95% credible interval upper bound (option 2) | 29.6 |
| 2008 | 95% credible interval upper bound (option 2) | 29.6 |
| 2009 | 95% credible interval upper bound (option 2) | 30.4 |
| 2010 | 95% credible interval upper bound (option 2) | 31.5 |
| 2011 | 95% credible interval upper bound (option 2) | 31.9 |
| 2012 | 95% credible interval upper bound (option 2) | 31.5 |
| 2013 | 95% credible interval upper bound (option 2) | 30.5 |
| 2014 | 95% credible interval upper bound (option 2) | 29.4 |
| 2015 | 95% credible interval upper bound (option 2) | 28.6 |
| 2016 | 95% credible interval upper bound (option 2) | 28.3 |
| 2017 | 95% credible interval upper bound (option 2) | 28.4 |
| 2018 | 95% credible interval upper bound (option 2) | 28.9 |
| 2019 | 95% credible interval upper bound (option 2) | 29.4 |
| 2020 | 95% credible interval upper bound (option 2) | 29.7 |
| 2021 | 95% credible interval upper bound (option 2) | 29.6 |
| 2022 | 95% credible interval upper bound (option 2) | 29.1 |
| 2023 | 95% credible interval upper bound (option 2) | 28.0 |