Year | Value | 2022 | 49.751413614595 | 2021 | 49.744407472191 | 2020 | 49.733273986502 | 2019 | 49.719921640863 | 2018 | 49.704856480828 | 2017 | 49.68885974618 | 2016 | 49.671263884832 | 2015 | 49.652629294888 | 2014 | 49.635944730636 | 2013 | 49.620141554756 | 2012 | 49.603880335492 | 2011 | 49.588935899754 | 2010 | 49.574596606753 | 2009 | 49.559482286284 | 2008 | 49.54494579166 | 2007 | 49.529629422807 | 2006 | 49.515396499436 | 2005 | 49.503183499552 | 2004 | 49.493000388139 | 2003 | 49.482956551228 | 2002 | 49.467147898459 | 2001 | 49.449088075022 | 2000 | 49.431708282973 | 1999 | 49.412352293879 | 1998 | 49.39503588607 | 1997 | 49.379465045358 | 1996 | 49.364108533341 | 1995 | 49.348992979634 | 1994 | 49.334151674402 | 1993 | 49.319502673874 | 1992 | 49.304671711878 | 1991 | 49.292958470046 | 1990 | 49.285866039164 | 1989 | 49.282401590984 | 1988 | 49.279228857298 | 1987 | 49.278415935925 | 1986 | 49.280956305357 | 1985 | 49.286290798312 | 1984 | 49.29578619862 | 1983 | 49.310114957423 | 1982 | 49.326759256695 | 1981 | 49.346720808991 | 1980 | 49.369628703522 | 1979 | 49.393505277358 | 1978 | 49.41659016663 | 1977 | 49.437649557895 | 1976 | 49.458402649616 | 1975 | 49.478638955376 | 1974 | 49.50086151527 | 1973 | 49.523867139216 | 1972 | 49.542588973712 | 1971 | 49.559041467551 | 1970 | 49.573153403753 | 1969 | 49.583765389876 | 1968 | 49.592623590361 | 1967 | 49.598922794034 | 1966 | 49.602295720355 | 1965 | 49.603444835805 | 1964 | 49.605533342829 | 1963 | 49.606414442622 | 1962 | 49.607468283429 | 1961 | 49.609509965895 | 1960 | 49.608826540734 |
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