Year | Value | 2022 | 82.653044909513 | 2021 | 81.170640432654 | 2020 | 83.094605907602 | 2019 | 83.672944220814 | 2018 | 83.320888353765 | 2017 | 82.245047901955 | 2016 | 82.588630622527 | 2015 | 82.666195316069 | 2014 | 83.010372727357 | 2013 | 82.94770789238 | 2012 | 83.122072326015 | 2011 | 81.127919347058 | 2010 | 80.363553073227 | 2009 | 79.798676684423 | 2008 | 80.109729798442 | 2007 | 79.354496212192 | 2006 | 79.425843812688 | 2005 | 79.742028224644 | 2004 | 80.674443669589 | 2003 | 78.76935096682 | 2002 | 79.462034146183 | 2001 | 81.935179588431 | 2000 | 82.191063562781 | 1999 | 82.857582587613 | 1998 | 82.67532170775 | 1997 | 82.793005462916 | 1996 | 81.964454725984 | 1995 | 81.227279880564 | 1994 | 82.654412125194 | 1993 | 81.936697313154 | 1992 | 82.981764216062 | 1991 | 82.327101301762 | 1990 | 81.826098421781 | 1989 | 77.69614848533 | 1988 | 78.440106942823 | 1987 | 78.16128211651 | 1986 | 75.933968905488 | 1985 | 74.480540724911 | 1984 | 74.987820169799 | 1983 | 73.870368815368 | 1982 | 73.063810626528 | 1981 | 69.95314354225 | 1980 | 66.306704769017 | 1979 | 68.543707611153 | 1978 | 69.732150815581 | 1977 | 70.174548406738 | 1976 | 70.653662353632 | 1975 | 69.993696816892 | 1974 | 64.726380542616 | 1973 | 66.620456613092 | 1972 | 70.009551098376 | 1971 | 70.831342570473 | 1970 | 69.088149907627 | 1969 | 67.277353689567 | 1968 | 66.800196206671 | 1967 | 65.242013981064 | 1966 | 66.752044133583 | 1965 | 66.705945366899 | 1964 | 67.529274004684 | 1963 | 66.206629691732 | 1962 | 67.589158345221 | 1961 | 67.42033383915 | 1960 | 68.42694831173 |
|