"Figure 19: There has been a 59% decline in the habitat specialist butterfly index between 1976 and 2019","" "Butterfly index 1976 = 100 for habitat specialists in semi-natural habitats, UK, 1976 to 2019","" "","" "Notes","" "Unit","Index 1976 = 100" "","" "","Unsmoothed","Smoothed","Smoothed index lower 95% confidence interval","Smoothed index upper 95% confidence interval" "1976","100","57","51","64" "1977","26","53","47","58" "1978","42","48","44","53" "1979","39","45","40","49" "1980","38","42","38","46" "1981","20","39","36","43" "1982","40","38","34","42" "1983","35","37","33","41" "1984","49","37","33","41" "1985","41","37","33","41" "1986","36","37","33","41" "1987","42","37","34","41" "1988","32","38","34","42" "1989","37","38","34","42" "1990","43","39","35","43" "1991","34","39","35","43" "1992","48","39","35","43" "1993","37","39","36","43" "1994","40","39","35","43" "1995","45","39","35","43" "1996","42","38","35","42" "1997","43","38","34","42" "1998","30","37","33","41" "1999","32","36","33","40" "2000","34","36","32","40" "2001","33","35","32","39" "2002","30","35","31","39" "2003","37","35","31","39" "2004","39","35","31","39" "2005","38","35","31","39" "2006","45","35","31","39" "2007","29","35","31","39" "2008","26","35","31","38" "2009","33","34","30","38" "2010","44","34","30","38" "2011","43","34","30","38" "2012","23","34","30","38" "2013","34","34","30","38" "2014","37","34","30","38" "2015","32","34","30","38" "2016","26","34","30","38" "2017","29","35","30","39" "2018","40","35","30","41" "2019","41","36","29","43"