Year | Value | 2022 | 49.864804692794 | 2021 | 49.850856036599 | 2020 | 49.818778777561 | 2019 | 49.767710255698 | 2018 | 49.697822406191 | 2017 | 49.62813608859 | 2016 | 49.559709529155 | 2015 | 49.488443087658 | 2014 | 49.415221285334 | 2013 | 49.344301239363 | 2012 | 49.274635341948 | 2011 | 49.204000638517 | 2010 | 49.132040536077 | 2009 | 49.060610195666 | 2008 | 48.990834486596 | 2007 | 48.974342276635 | 2006 | 49.006152309579 | 2005 | 49.033457801429 | 2004 | 49.059414280011 | 2003 | 49.085174751196 | 2002 | 49.109003389846 | 2001 | 49.131008415347 | 2000 | 49.152982129923 | 1999 | 49.174299447914 | 1998 | 49.195217870451 | 1997 | 49.219460781633 | 1996 | 49.238454411466 | 1995 | 49.253893361405 | 1994 | 49.275483274596 | 1993 | 49.296627715732 | 1992 | 49.317349105748 | 1991 | 49.338711979124 | 1990 | 49.354586574068 | 1989 | 49.363274940986 | 1988 | 49.369415335505 | 1987 | 49.372398241602 | 1986 | 49.378583412553 | 1985 | 49.384778015591 | 1984 | 49.382811609419 | 1983 | 49.378526023187 | 1982 | 49.374341733053 | 1981 | 49.370600790155 | 1980 | 49.366411100527 | 1979 | 49.359554367513 | 1978 | 49.350810203859 | 1977 | 49.342470827931 | 1976 | 49.319731950011 | 1975 | 49.279094969816 | 1974 | 49.234322686369 | 1973 | 49.184019926639 | 1972 | 49.130526830657 | 1971 | 49.076951672862 | 1970 | 49.02148079919 | 1969 | 48.96160571968 | 1968 | 48.899855527601 | 1967 | 48.838328292549 | 1966 | 48.77580552204 | 1965 | 48.715805633142 | 1964 | 48.654478992298 | 1963 | 48.589779897369 | 1962 | 48.522662177486 | 1961 | 48.450790526229 | 1960 | 48.377094422919 |
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