"Figure 17: Water and wetland bird populations decreased by 15% between 1975 and 2019","" "Water and wetland bird index 1975 = 100, UK, 1975 to 2019","" "","" "Notes","" "Unit","Index 1975 = 100" "","" "","Unsmoothed data","Smoothed data","Smoothed 2·5 CI","Smoothed 97·5 CI" "1975","100","100","100","100" "1976","102","103","100","105" "1977","108","103","100","108" "1978","95","102","96","108" "1979","94","100","93","108" "1980","99","99","92","109" "1981","98","98","90","109" "1982","89","98","89","109" "1983","97","98","88","109" "1984","97","97","87","108" "1985","95","97","87","107" "1986","89","97","87","108" "1987","94","99","88","111" "1988","100","101","90","114" "1989","103","102","91","116" "1990","104","101","89","115" "1991","90","98","87","112" "1992","92","96","84","110" "1993","90","95","82","108" "1994","89","96","81","108" "1995","106","97","82","109" "1996","98","97","81","109" "1997","92","96","82","111" "1998","92","96","83","112" "1999","94","97","84","113" "2000","100","99","86","115" "2001","100","100","86","116" "2002","100","100","87","117" "2003","100","100","87","116" "2004","98","99","86","113" "2005","94","98","85","111" "2006","99","98","84","111" "2007","95","98","84","112" "2008","101","97","83","111" "2009","91","95","82","109" "2010","98","92","79","106" "2011","85","89","77","103" "2012","85","87","75","101" "2013","83","87","75","101" "2014","87","88","76","101" "2015","92","90","77","103" "2016","94","91","78","104" "2017","95","90","77","103" "2018","83","88","75","101" "2019","86","85","72","98"