Year | Value | 2021 | 46.188654337885 | 2020 | 46.30281025081 | 2019 | 47.160790806891 | 2018 | 46.721132122801 | 2017 | 46.633657892167 | 2016 | 46.683137024394 | 2015 | 46.955071802716 | 2014 | 46.862198091769 | 2013 | 46.956522132558 | 2012 | 46.880341419722 | 2011 | 47.21420491954 | 2010 | 47.052212068145 | 2009 | 47.916337985973 | 2008 | 47.994909542767 | 2007 | 47.769314373616 | 2006 | 48.73161296521 | 2005 | 48.882773009849 | 2004 | 48.846856872541 | 2003 | 49.595843971284 | 2002 | 50.434433458201 | 2001 | 52.071144077345 | 2000 | 53.490188412526 | 1999 | 54.705860527747 | 1998 | 54.758842996596 | 1997 | 55.225300148321 | 1996 | 55.269856581427 | 1995 | 55.739117292783 | 1994 | 56.238557764792 | 1993 | 56.550616901834 | 1992 | 57.252114900311 | 1991 | 62.712393887946 | 1990 | 62.753008938517 | 1989 | 62.7828945581 | 1988 | 63.201877552128 | 1987 | 63.270206473669 | 1986 | 63.22543885829 | 1985 | 63.274276256885 | 1984 | 63.294625172966 | 1983 | 63.228152047101 | 1982 | 63.240860069185 | 1981 | 63.267133322481 | 1980 | 63.457547105824 | 1979 | 63.582842724979 | 1978 | 63.731806898797 | 1977 | 63.826266243455 | 1976 | 63.901737632425 | 1975 | 63.609728307313 | 1974 | 63.760291903476 | 1973 | 63.815905484042 | 1972 | 63.999023371268 | 1971 | 64.168576970552 | 1970 | 64.236883511475 | 1969 | 64.340454391319 | 1968 | 64.473380807053 | 1967 | 64.338225320782 | 1966 | 64.441792016493 | 1965 | 64.402940538194 | 1964 | 64.591951606559 | 1963 | 64.540411507005 | 1962 | 64.625379774306 | 1961 | 64.66702834667 |
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