Year | Value | 2022 | 49.994296279611 | 2021 | 49.965802974297 | 2020 | 49.940085163197 | 2019 | 49.919166601764 | 2018 | 49.898725066627 | 2017 | 49.881093554822 | 2016 | 49.864788214038 | 2015 | 49.847852261441 | 2014 | 49.832545050996 | 2013 | 49.819254163854 | 2012 | 49.807804892673 | 2011 | 49.796919865827 | 2010 | 49.785926859894 | 2009 | 49.773127068346 | 2008 | 49.758847389814 | 2007 | 49.745372711243 | 2006 | 49.731760195808 | 2005 | 49.719095981892 | 2004 | 49.708850639579 | 2003 | 49.699279713318 | 2002 | 49.690209364281 | 2001 | 49.681932053068 | 2000 | 49.673061849476 | 1999 | 49.661688150242 | 1998 | 49.650457251373 | 1997 | 49.638754234947 | 1996 | 49.627622302074 | 1995 | 49.617924707853 | 1994 | 49.60881612495 | 1993 | 49.603009597777 | 1992 | 49.599676574434 | 1991 | 49.599433724742 | 1990 | 49.600206189941 | 1989 | 49.598847158543 | 1988 | 49.598778728093 | 1987 | 49.601671342528 | 1986 | 49.605263481315 | 1985 | 49.608239402799 | 1984 | 49.611601513241 | 1983 | 49.617163870641 | 1982 | 49.621684347533 | 1981 | 49.625725517 | 1980 | 49.625626940778 | 1979 | 49.620305645442 | 1978 | 49.614995997743 | 1977 | 49.606852891091 | 1976 | 49.596501847252 | 1975 | 49.584866349409 | 1974 | 49.569461213127 | 1973 | 49.552821761229 | 1972 | 49.535551945312 | 1971 | 49.515241780837 | 1970 | 49.493532618741 | 1969 | 49.469868790588 | 1968 | 49.447627528493 | 1967 | 49.42932906307 | 1966 | 49.412462929532 | 1965 | 49.39310029849 | 1964 | 49.372364430394 | 1963 | 49.355852312119 | 1962 | 49.34096363811 | 1961 | 49.325281598237 | 1960 | 49.308921772381 |
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