Year | Value | 2022 | 60.446297212714 | 2021 | 60.687711532246 | 2020 | 60.905176407063 | 2019 | 61.117205553474 | 2018 | 61.322977272963 | 2017 | 61.531455219918 | 2016 | 61.740239734577 | 2015 | 61.955902242964 | 2014 | 62.17750730842 | 2013 | 62.402152104037 | 2012 | 62.629205151339 | 2011 | 62.860164550179 | 2010 | 63.101710200873 | 2009 | 63.36732237828 | 2008 | 63.655626602816 | 2007 | 63.94281790665 | 2006 | 64.198039194104 | 2005 | 64.439675908803 | 2004 | 64.66134201683 | 2003 | 64.882753085476 | 2002 | 65.087878283902 | 2001 | 65.295559293148 | 2000 | 65.540329085432 | 1999 | 65.791684571566 | 1998 | 66.01472948102 | 1997 | 66.234323886065 | 1996 | 66.46728431796 | 1995 | 66.798882471083 | 1994 | 67.088352933313 | 1993 | 67.401198400434 | 1992 | 67.723385756896 | 1991 | 68.056967774549 | 1990 | 68.413089106614 | 1989 | 68.790566403691 | 1988 | 69.189401540023 | 1987 | 69.605167130883 | 1986 | 70.007145836774 | 1985 | 70.235407052039 | 1984 | 70.466772846391 | 1983 | 70.700931116868 | 1982 | 70.9247480325 | 1981 | 71.134718424469 | 1980 | 71.33394338633 | 1979 | 71.502589537573 | 1978 | 71.661884762315 | 1977 | 71.818747791574 | 1976 | 71.981538647715 | 1975 | 72.190788078628 | 1974 | 72.380775725474 | 1973 | 72.598306112143 | 1972 | 72.905234620293 | 1971 | 73.22826852294 | 1970 | 73.575037982047 | 1969 | 73.962095420442 | 1968 | 74.36313695071 | 1967 | 74.743049180685 | 1966 | 75.118699665297 | 1965 | 75.582844903523 | 1964 | 76.052120157739 | 1963 | 76.518696351112 | 1962 | 76.976707791031 | 1961 | 77.42299269828 | 1960 | 77.856736505521 |
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