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Indicators of the average population status of characteristic species (Aerial insectivores)

Line graph depicting the percent change in population size of two subgroups of aerial insectivores since 1970
Indicators of the average population status of two groups of Aerial insectivores
Year Swallows, Swifts and Nightjars Flycatchers
1970 0 0
1971 -5.9 1
1972 -11.1 -2
1973 -25.2 -3.6
1974 -29.5 -4.4
1975 -35.5 -7.9
1976 -38 -6.4
1977 -41.6 -8.3
1978 -43.7 -9.4
1979 -46.5 -11.3
1980 -49.3 -10.5
1981 -51.7 -14
1982 -52.1 -14
1983 -55.1 -15.6
1984 -57.3 -17.7
1985 -57.8 -16.9
1986 -58.6 -19.4
1987 -60.1 -21.8
1988 -61.4 -22.7
1989 -62.9 -26
1990 -64.9 -24.5
1991 -65.1 -25.5
1992 -66.9 -26.4
1993 -68.3 -27.3
1994 -69.1 -30.3
1995 -70 -31.8
1996 -70.8 -33.1
1997 -71.4 -34.1
1998 -72.4 -35.4
1999 -73.5 -37.6
2000 -75.2 -39.2
2001 -76.8 -40.4
2002 -77.7 -40.6
2003 -78.7 -41.5
2004 -79 -43.3
2005 -79.6 -44.3
2006 -80.4 -45.2
2007 -81.1 -44.5
2008 -81.5 -45.2
2009 -82 -45.1
2010 -82.5 -46.9

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