Year | Value | 2022 | 81.104531295799 | 2021 | 77.653365750437 | 2020 | 79.088853285736 | 2019 | 80.250943577941 | 2018 | 78.21909841509 | 2017 | 76.92185060146 | 2016 | 76.209568946896 | 2015 | 76.06926630752 | 2014 | 75.972575281913 | 2013 | 75.36950996233 | 2012 | 73.649265927006 | 2011 | 72.006689308995 | 2010 | 70.234899782248 | 2009 | 70.280579420158 | 2008 | 68.785238189222 | 2007 | 67.928573332461 | 2006 | 66.55318684725 | 2005 | 66.723554926087 | 2004 | 68.9318265172 | 2003 | 68.523055792735 | 2002 | 68.661978616262 | 2001 | 69.818384397741 | 2000 | 68.008696815928 | 1999 | 69.855654903083 | 1998 | 70.460004556317 | 1997 | 69.157144906754 | 1996 | 69.684392710764 | 1995 | 70.190329631834 | 1994 | 67.463534074561 | 1993 | 66.003909732441 | 1992 | 66.622972755318 | 1991 | 66.279004170265 | 1990 | 64.291554861361 | 1989 | 62.013612694247 | 1988 | 62.72195950875 | 1987 | 63.518504445627 | 1986 | 67.464004367834 | 1985 | 68.460564919749 | 1984 | 67.57954441357 | 1983 | 71.525351963586 | 1982 | 68.452335399607 | 1981 | 66.578713892314 | 1980 | 65.663317527625 | 1979 | 66.071824724246 | 1978 | 70.255997761768 | 1977 | 66.945035751324 | 1976 | 63.938501488378 | 1975 | 71.461412813325 | 1974 | 71.024555461473 | 1973 | 70.803590872795 | 1972 | 68.636885729364 | 1971 | 71.45534275327 | 1970 | 71.890418073228 | 1969 | 74.821217266039 | 1968 | 78.001572612351 | 1967 | 75.237479806139 | 1966 | 75.892732110349 | 1965 | 68.544399053967 | 1964 | 71.416554508748 | 1963 | 73.626162846456 | 1962 | 79.866467134799 | 1961 | 83.608316566063 | 1960 | 78.496726660489 |
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