Year | Value | 2022 | 37.764568121961 | 2021 | 38.526875430216 | 2020 | 39.301337075742 | 2019 | 40.109082189558 | 2018 | 40.945296333619 | 2017 | 41.802760927054 | 2016 | 42.67779399544 | 2015 | 43.561361874437 | 2014 | 44.447685662655 | 2013 | 45.336253337964 | 2012 | 46.224005543384 | 2011 | 47.117531525204 | 2010 | 48.045914361877 | 2009 | 49.071418085318 | 2008 | 50.101618381668 | 2007 | 51.141379947585 | 2006 | 52.178593342791 | 2005 | 53.230645622807 | 2004 | 54.313566113098 | 2003 | 55.400363280821 | 2002 | 56.484197422087 | 2001 | 57.567483629405 | 2000 | 58.559457967929 | 1999 | 59.366872344367 | 1998 | 60.1461582471 | 1997 | 60.916704966929 | 1996 | 61.673439822218 | 1995 | 62.432148072898 | 1994 | 63.177444118859 | 1993 | 63.909249957112 | 1992 | 64.624222919406 | 1991 | 65.326160898409 | 1990 | 66.019694472948 | 1989 | 66.667892790273 | 1988 | 67.305833001513 | 1987 | 67.931185621055 | 1986 | 68.55017554902 | 1985 | 69.155273656582 | 1984 | 69.74816016924 | 1983 | 70.337843387612 | 1982 | 70.911698246711 | 1981 | 71.575772579668 | 1980 | 72.240656859071 | 1979 | 72.876125804044 | 1978 | 73.48468240124 | 1977 | 73.875044855465 | 1976 | 74.062683611437 | 1975 | 74.255590365046 | 1974 | 74.38920072579 | 1973 | 74.647912130236 | 1972 | 74.828984839058 | 1971 | 74.930394116171 | 1970 | 75.046934963697 | 1969 | 75.125890733877 | 1968 | 75.20152289801 | 1967 | 75.27144589084 | 1966 | 75.321300209255 | 1965 | 75.320758311395 | 1964 | 75.321383236415 | 1963 | 75.796462205226 | 1962 | 76.260878988911 | 1961 | 76.787681183411 | 1960 | 77.372392756454 |
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