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Research and analysis

D6bi: Distribution of priority species in England, 1970 to 2024

Updated 13 May 2026

year measure value
1970 Smoothed index 100.0
1971 Smoothed index 99.71766586
1972 Smoothed index 98.96809549
1973 Smoothed index 98.1344088
1974 Smoothed index 97.44465818
1975 Smoothed index 96.99634873
1976 Smoothed index 96.41234925
1977 Smoothed index 94.94846184
1978 Smoothed index 93.79147631
1979 Smoothed index 92.81874939
1980 Smoothed index 91.69285885
1981 Smoothed index 90.52811753
1982 Smoothed index 90.10730236
1983 Smoothed index 89.66604816
1984 Smoothed index 88.89069919
1985 Smoothed index 87.70123165
1986 Smoothed index 86.90496023
1987 Smoothed index 86.5644127
1988 Smoothed index 86.21519839
1989 Smoothed index 86.55893477
1990 Smoothed index 86.95223284
1991 Smoothed index 86.92872559
1992 Smoothed index 86.52163047
1993 Smoothed index 86.119535
1994 Smoothed index 86.3919849
1995 Smoothed index 87.30569071
1996 Smoothed index 87.76196909
1997 Smoothed index 87.7567179
1998 Smoothed index 86.60208523
1999 Smoothed index 86.211895
2000 Smoothed index 86.14079299
2001 Smoothed index 86.30612378
2002 Smoothed index 85.98527833
2003 Smoothed index 85.83840848
2004 Smoothed index 84.93646744
2005 Smoothed index 84.24381167
2006 Smoothed index 83.70544228
2007 Smoothed index 80.88586432
2008 Smoothed index 79.73756016
2009 Smoothed index 80.17905042
2010 Smoothed index 80.18707587
2011 Smoothed index 79.75797205
2012 Smoothed index 77.19892077
2013 Smoothed index 77.75068059
2014 Smoothed index 76.99357541
2015 Smoothed index 76.00031528
2016 Smoothed index 75.25840213
2017 Smoothed index 75.0426748
2018 Smoothed index 74.87900041
2019 Smoothed index 74.87840235
2020 Smoothed index 75.20167342
2021 Smoothed index 76.03482298
2022 Smoothed index 77.33320163
2023 Smoothed index 79.21342071
2024 Smoothed index 81.68863941
1970 95% credible interval lower bound 100.0
1971 95% credible interval lower bound 98.3177315
1972 95% credible interval lower bound 97.12886121
1973 95% credible interval lower bound 95.96892623
1974 95% credible interval lower bound 95.12471036
1975 95% credible interval lower bound 94.66177394
1976 95% credible interval lower bound 94.01242286
1977 95% credible interval lower bound 92.57872784
1978 95% credible interval lower bound 91.40937671
1979 95% credible interval lower bound 90.53025736
1980 95% credible interval lower bound 89.33804072
1981 95% credible interval lower bound 88.27477997
1982 95% credible interval lower bound 87.78503408
1983 95% credible interval lower bound 87.39914344
1984 95% credible interval lower bound 86.58758807
1985 95% credible interval lower bound 85.40127288
1986 95% credible interval lower bound 84.62331643
1987 95% credible interval lower bound 84.37880204
1988 95% credible interval lower bound 84.05319206
1989 95% credible interval lower bound 84.33046339
1990 95% credible interval lower bound 84.79044872
1991 95% credible interval lower bound 84.82516508
1992 95% credible interval lower bound 84.37120484
1993 95% credible interval lower bound 83.99748827
1994 95% credible interval lower bound 84.29189673
1995 95% credible interval lower bound 85.23122816
1996 95% credible interval lower bound 85.63797161
1997 95% credible interval lower bound 85.66689787
1998 95% credible interval lower bound 84.51402962
1999 95% credible interval lower bound 84.13037429
2000 95% credible interval lower bound 84.03196902
2001 95% credible interval lower bound 84.23289711
2002 95% credible interval lower bound 83.95140225
2003 95% credible interval lower bound 83.84038634
2004 95% credible interval lower bound 83.00278381
2005 95% credible interval lower bound 82.17695863
2006 95% credible interval lower bound 81.68455571
2007 95% credible interval lower bound 78.94893023
2008 95% credible interval lower bound 77.81223385
2009 95% credible interval lower bound 78.19405715
2010 95% credible interval lower bound 78.21424158
2011 95% credible interval lower bound 77.6992249
2012 95% credible interval lower bound 75.19445422
2013 95% credible interval lower bound 75.74516376
2014 95% credible interval lower bound 74.87510739
2015 95% credible interval lower bound 73.79328167
2016 95% credible interval lower bound 72.88508913
2017 95% credible interval lower bound 72.38932008
2018 95% credible interval lower bound 71.79635568
2019 95% credible interval lower bound 71.3039121
2020 95% credible interval lower bound 71.04844073
2021 95% credible interval lower bound 71.12489891
2022 95% credible interval lower bound 71.17974172
2023 95% credible interval lower bound 71.34691037
2024 95% credible interval lower bound 70.94683405
1970 95% credible interval upper bound 100.0
1971 95% credible interval upper bound 101.2173731
1972 95% credible interval upper bound 100.9493441
1973 95% credible interval upper bound 100.4365713
1974 95% credible interval upper bound 99.85831485
1975 95% credible interval upper bound 99.46912598
1976 95% credible interval upper bound 98.85685596
1977 95% credible interval upper bound 97.39858925
1978 95% credible interval upper bound 96.24047704
1979 95% credible interval upper bound 95.26137042
1980 95% credible interval upper bound 94.14873898
1981 95% credible interval upper bound 92.97119542
1982 95% credible interval upper bound 92.50856097
1983 95% credible interval upper bound 92.05360912
1984 95% credible interval upper bound 91.26993653
1985 95% credible interval upper bound 90.04389354
1986 95% credible interval upper bound 89.25538719
1987 95% credible interval upper bound 88.85836746
1988 95% credible interval upper bound 88.3724913
1989 95% credible interval upper bound 88.72481716
1990 95% credible interval upper bound 89.08763352
1991 95% credible interval upper bound 89.05456287
1992 95% credible interval upper bound 88.68663351
1993 95% credible interval upper bound 88.22384976
1994 95% credible interval upper bound 88.54219703
1995 95% credible interval upper bound 89.51928282
1996 95% credible interval upper bound 89.88562654
1997 95% credible interval upper bound 89.94773168
1998 95% credible interval upper bound 88.70634451
1999 95% credible interval upper bound 88.29888051
2000 95% credible interval upper bound 88.17458354
2001 95% credible interval upper bound 88.38700972
2002 95% credible interval upper bound 88.07090243
2003 95% credible interval upper bound 87.96742424
2004 95% credible interval upper bound 86.98048758
2005 95% credible interval upper bound 86.31196862
2006 95% credible interval upper bound 85.72991216
2007 95% credible interval upper bound 82.84089649
2008 95% credible interval upper bound 81.70518314
2009 95% credible interval upper bound 82.18431772
2010 95% credible interval upper bound 82.17933899
2011 95% credible interval upper bound 81.84671861
2012 95% credible interval upper bound 79.29865345
2013 95% credible interval upper bound 79.8666944
2014 95% credible interval upper bound 79.22454813
2015 95% credible interval upper bound 78.23252517
2016 95% credible interval upper bound 77.69223698
2017 95% credible interval upper bound 77.85326237
2018 95% credible interval upper bound 78.02616159
2019 95% credible interval upper bound 78.4644688
2020 95% credible interval upper bound 79.38651583
2021 95% credible interval upper bound 81.11174481
2022 95% credible interval upper bound 84.04420265
2023 95% credible interval upper bound 88.0290163
2024 95% credible interval upper bound 94.09877476