"Figure 15: Woodland bird populations decreased by 25% between 1970 and 2019","" "Woodland Bird Index 1970 = 100, UK, 1970 to 2019","" "","" "Notes","" "Unit","Index 1970 = 100" "","" "","Unsmoothed data","Smoothed data","Smoothed 2·5 CI","Smoothed 97·5 CI" "1970","100","100","100","100" "1971","106","103","102","104" "1972","111","105","103","107" "1973","109","106","103","108" "1974","109","105","102","109" "1975","110","104","101","108" "1976","102","102","98","107" "1977","107","100","96","105" "1978","99","97","93","102" "1979","92","96","92","101" "1980","102","95","91","100" "1981","103","95","91","101" "1982","93","94","90","101" "1983","99","94","89","100" "1984","98","93","88","99" "1985","97","91","87","98" "1986","87","90","85","96" "1987","89","89","85","95" "1988","94","89","85","95" "1989","97","89","84","95" "1990","91","86","82","93" "1991","83","83","79","89" "1992","80","80","76","86" "1993","81","79","74","84" "1994","82","78","73","84" "1995","76","78","73","84" "1996","81","79","73","84" "1997","84","79","73","85" "1998","81","79","73","85" "1999","80","79","73","85" "2000","81","78","72","84" "2001","79","77","71","83" "2002","77","77","71","82" "2003","79","76","70","82" "2004","76","76","70","82" "2005","80","76","70","82" "2006","76","77","71","82" "2007","79","77","71","83" "2008","82","77","71","83" "2009","72","78","72","84" "2010","82","79","72","84" "2011","83","79","73","85" "2012","84","79","73","85" "2013","73","78","72","85" "2014","81","78","71","84" "2015","81","77","71","83" "2016","78","76","70","81" "2017","75","74","68","80" "2018","72","73","67","78" "2019","75","72","65","77"