Year All common birds (136) Common farmland birds (36) Common forest birds (29)
1980 100 100 100
1981 104.1820538 91.15511895 112.39637
1982 95.90537544 84.627925 109.5090494
1983 95.75956686 78.53940791 109.1330691
1984 93.27067689 78.61502075 102.9336477
1985 86.10822703 68.69512003 101.1282942
1986 83.15722097 61.88686873 93.93765841
1987 88.27578975 68.82110036 99.43909731
1988 89.1749309 64.12222484 101.2802742
1989 97.76623321 68.27874761 117.6995179
1990 97.72301992 64.00154428 117.6170047
1991 94.84386295 59.44350438 118.742339
1992 93.13263054 61.69230079 112.7275881
1993 94.16929586 65.8830314 105.1338946
1994 93.3451171 61.63766634 109.087199
1995 88.35820691 54.29029907 100.5476589
1996 88.39352209 55.05799075 102.9914255
1997 90.76278469 55.6214031 103.6543898
1998 89.18344395 56.68949445 97.85421163
1999 88.88823622 57.02548267 90.82415546
2000 89.71551507 57.92089826 89.76263901
2001 92.03750071 56.90627774 94.14336083
2002 90.21100034 53.19439013 94.62930442
2003 90.59606626 53.31398665 96.59330563
2004 93.13506494 53.67377449 100.1032357
2005 91.40821648 55.60188677 95.79243886
2006 89.92153502 54.21925629 94.87314103
2007 91.86565633 52.22324109 97.56412292