See more information about this guidance

Research and analysis

D6bi: Distribution of priority species in England, 1970 to 2016

Updated 1 December 2025
Download CSV 5.33 KB

year measure value
1970 Smoothed index 100.0
1971 Smoothed index 100.37
1972 Smoothed index 100.14
1973 Smoothed index 99.71
1974 Smoothed index 99.33
1975 Smoothed index 99.28
1976 Smoothed index 98.93
1977 Smoothed index 97.46
1978 Smoothed index 96.36
1979 Smoothed index 95.56
1980 Smoothed index 94.62
1981 Smoothed index 93.78
1982 Smoothed index 94.06
1983 Smoothed index 94.34
1984 Smoothed index 93.96
1985 Smoothed index 92.79
1986 Smoothed index 91.89
1987 Smoothed index 91.61
1988 Smoothed index 91.32
1989 Smoothed index 91.79
1990 Smoothed index 92.35
1991 Smoothed index 92.32
1992 Smoothed index 91.92
1993 Smoothed index 91.56
1994 Smoothed index 92.1
1995 Smoothed index 93.39
1996 Smoothed index 94.13
1997 Smoothed index 94.33
1998 Smoothed index 93.25
1999 Smoothed index 93.14
2000 Smoothed index 93.61
2001 Smoothed index 94.55
2002 Smoothed index 95.21
2003 Smoothed index 95.95
2004 Smoothed index 95.49
2005 Smoothed index 95.31
2006 Smoothed index 95.12
2007 Smoothed index 91.74
2008 Smoothed index 90.79
2009 Smoothed index 91.9
2010 Smoothed index 92.29
2011 Smoothed index 92.26
2012 Smoothed index 89.06
2013 Smoothed index 89.86
2014 Smoothed index 88.24
2015 Smoothed index 86.15
2016 Smoothed index 83.68
1970 95% credible interval lower bound 100.0
1971 95% credible interval lower bound 98.65
1972 95% credible interval lower bound 97.8
1973 95% credible interval lower bound 97.02
1974 95% credible interval lower bound 96.56
1975 95% credible interval lower bound 96.37
1976 95% credible interval lower bound 96.07
1977 95% credible interval lower bound 94.6
1978 95% credible interval lower bound 93.5
1979 95% credible interval lower bound 92.6
1980 95% credible interval lower bound 91.72
1981 95% credible interval lower bound 90.95
1982 95% credible interval lower bound 91.2
1983 95% credible interval lower bound 91.42
1984 95% credible interval lower bound 91.12
1985 95% credible interval lower bound 89.99
1986 95% credible interval lower bound 89.16
1987 95% credible interval lower bound 88.92
1988 95% credible interval lower bound 88.59
1989 95% credible interval lower bound 89.0
1990 95% credible interval lower bound 89.6
1991 95% credible interval lower bound 89.65
1992 95% credible interval lower bound 89.24
1993 95% credible interval lower bound 88.97
1994 95% credible interval lower bound 89.43
1995 95% credible interval lower bound 90.72
1996 95% credible interval lower bound 91.45
1997 95% credible interval lower bound 91.79
1998 95% credible interval lower bound 90.73
1999 95% credible interval lower bound 90.65
2000 95% credible interval lower bound 90.98
2001 95% credible interval lower bound 91.97
2002 95% credible interval lower bound 92.67
2003 95% credible interval lower bound 93.33
2004 95% credible interval lower bound 92.91
2005 95% credible interval lower bound 92.8
2006 95% credible interval lower bound 92.51
2007 95% credible interval lower bound 89.12
2008 95% credible interval lower bound 88.2
2009 95% credible interval lower bound 89.32
2010 95% credible interval lower bound 89.5
2011 95% credible interval lower bound 89.49
2012 95% credible interval lower bound 86.24
2013 95% credible interval lower bound 86.96
2014 95% credible interval lower bound 85.28
2015 95% credible interval lower bound 82.71
2016 95% credible interval lower bound 79.39
1970 95% credible interval upper bound 100.0
1971 95% credible interval upper bound 102.18
1972 95% credible interval upper bound 102.56
1973 95% credible interval upper bound 102.47
1974 95% credible interval upper bound 102.2
1975 95% credible interval upper bound 102.16
1976 95% credible interval upper bound 101.77
1977 95% credible interval upper bound 100.27
1978 95% credible interval upper bound 99.2
1979 95% credible interval upper bound 98.47
1980 95% credible interval upper bound 97.52
1981 95% credible interval upper bound 96.74
1982 95% credible interval upper bound 97.06
1983 95% credible interval upper bound 97.32
1984 95% credible interval upper bound 96.93
1985 95% credible interval upper bound 95.71
1986 95% credible interval upper bound 94.7
1987 95% credible interval upper bound 94.37
1988 95% credible interval upper bound 94.06
1989 95% credible interval upper bound 94.58
1990 95% credible interval upper bound 95.21
1991 95% credible interval upper bound 95.11
1992 95% credible interval upper bound 94.62
1993 95% credible interval upper bound 94.26
1994 95% credible interval upper bound 94.73
1995 95% credible interval upper bound 96.14
1996 95% credible interval upper bound 96.86
1997 95% credible interval upper bound 96.98
1998 95% credible interval upper bound 95.94
1999 95% credible interval upper bound 95.77
2000 95% credible interval upper bound 96.23
2001 95% credible interval upper bound 97.24
2002 95% credible interval upper bound 97.9
2003 95% credible interval upper bound 98.64
2004 95% credible interval upper bound 98.14
2005 95% credible interval upper bound 97.97
2006 95% credible interval upper bound 97.81
2007 95% credible interval upper bound 94.42
2008 95% credible interval upper bound 93.47
2009 95% credible interval upper bound 94.67
2010 95% credible interval upper bound 95.2
2011 95% credible interval upper bound 95.13
2012 95% credible interval upper bound 92.12
2013 95% credible interval upper bound 93.05
2014 95% credible interval upper bound 91.52
2015 95% credible interval upper bound 89.65
2016 95% credible interval upper bound 87.94