Year | Value | 2022 | 49.628808162384 | 2021 | 49.648276841447 | 2020 | 49.66912992269 | 2019 | 49.68612487593 | 2018 | 49.699677827616 | 2017 | 49.713958315108 | 2016 | 49.726511613362 | 2015 | 49.736896763159 | 2014 | 49.749213163251 | 2013 | 49.75822045314 | 2012 | 49.764276739841 | 2011 | 49.770231135202 | 2010 | 49.773879214403 | 2009 | 49.774997974704 | 2008 | 49.7744895717 | 2007 | 49.776120093019 | 2006 | 49.774897366659 | 2005 | 49.771983520709 | 2004 | 49.767037768841 | 2003 | 49.758373831706 | 2002 | 49.747506427973 | 2001 | 49.733765300657 | 2000 | 49.719486869182 | 1999 | 49.706340678176 | 1998 | 49.691763080642 | 1997 | 49.675195347012 | 1996 | 49.660978299819 | 1995 | 49.6490734873 | 1994 | 49.638238459478 | 1993 | 49.628209302211 | 1992 | 49.638878235935 | 1991 | 49.655620098613 | 1990 | 49.655129397945 | 1989 | 49.646903497191 | 1988 | 49.636457497559 | 1987 | 49.625225528001 | 1986 | 49.614411034067 | 1985 | 49.604326331577 | 1984 | 49.593883126263 | 1983 | 49.583929338692 | 1982 | 49.572808425558 | 1981 | 49.56316141054 | 1980 | 49.555258684257 | 1979 | 49.54796999234 | 1978 | 49.541887402353 | 1977 | 49.537503506755 | 1976 | 49.532062240519 | 1975 | 49.524407667009 | 1974 | 49.516952384933 | 1973 | 49.512482588664 | 1972 | 49.509180919181 | 1971 | 49.503647268601 | 1970 | 49.496810477978 | 1969 | 49.494054213753 | 1968 | 49.494000062663 | 1967 | 49.494090849069 | 1966 | 49.493357940004 | 1965 | 49.494355164932 | 1964 | 49.498275778328 | 1963 | 49.502406061227 | 1962 | 49.507098215244 | 1961 | 49.51383443486 | 1960 | 49.51826855946 |
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