Year | Value | 2022 | 50.543712216212 | 2021 | 50.537177999755 | 2020 | 50.50734413894 | 2019 | 50.45783270288 | 2018 | 50.386115073704 | 2017 | 50.307830953849 | 2016 | 50.226569668991 | 2015 | 50.137577505136 | 2014 | 50.043141447677 | 2013 | 49.941637329698 | 2012 | 49.840933191941 | 2011 | 49.743985280315 | 2010 | 49.647523350996 | 2009 | 49.552938101994 | 2008 | 49.436090225564 | 2007 | 49.310752264671 | 2006 | 49.248516809492 | 2005 | 49.241240900098 | 2004 | 49.233596100385 | 2003 | 49.227085528206 | 2002 | 49.220646603214 | 2001 | 49.202596647612 | 2000 | 49.17984854244 | 1999 | 49.158675060305 | 1998 | 49.137088896125 | 1997 | 49.106876750979 | 1996 | 49.104246718898 | 1995 | 49.135301119257 | 1994 | 49.165254534698 | 1993 | 49.203956096973 | 1992 | 49.254483175499 | 1991 | 49.306130693869 | 1990 | 49.355292878341 | 1989 | 49.399770276177 | 1988 | 49.434852306027 | 1987 | 49.461968128799 | 1986 | 49.441686066874 | 1985 | 49.370975220236 | 1984 | 49.297066644679 | 1983 | 49.217888039925 | 1982 | 49.138046651742 | 1981 | 49.064494145344 | 1980 | 48.994912520164 | 1979 | 48.924419207096 | 1978 | 48.853232460744 | 1977 | 48.780869510783 | 1976 | 48.740531599962 | 1975 | 48.74247141008 | 1974 | 48.748464790722 | 1973 | 48.728079372262 | 1972 | 48.682161859423 | 1971 | 48.634874408446 | 1970 | 48.592803293095 | 1969 | 48.549948821723 | 1968 | 48.505333812777 | 1967 | 48.467421229734 | 1966 | 48.476075895431 | 1965 | 48.52225626239 | 1964 | 48.561103462883 | 1963 | 48.602279380727 | 1962 | 48.64262901328 | 1961 | 48.690752403049 | 1960 | 48.739396096577 |
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