Year | Value | 2021 | 69.058 | 2020 | 68.888 | 2019 | 68.224 | 2018 | 65.625 | 2017 | 62.957 | 2016 | 61.574 | 2015 | 60.566 | 2014 | 58.228 | 2013 | 58.832 | 2012 | 62.428 | 2011 | 70.546 | 2010 | 71.352 | 2009 | 71.329 | 2008 | 71.113 | 2007 | 71.214 | 2006 | 70.993 | 2005 | 70.633 | 2004 | 70.406 | 2003 | 70.123 | 2002 | 69.77 | 2001 | 69.536 | 2000 | 68.652 | 1999 | 68.398 | 1998 | 68.361 | 1997 | 68.444 | 1996 | 68.516 | 1995 | 68.594 | 1994 | 68.351 | 1993 | 68.411 | 1992 | 68.512 | 1991 | 68.182 | 1990 | 68.162 | 1989 | 68.166 | 1988 | 68.119 | 1987 | 67.796 | 1986 | 67.805 | 1985 | 67.397 | 1984 | 67.412 | 1983 | 66.315 | 1982 | 57.578 | 1981 | 62.193 | 1980 | 64.836 | 1979 | 64.894 | 1978 | 64.728 | 1977 | 63.15 | 1976 | 63.238 | 1975 | 62.971 | 1974 | 62.392 | 1973 | 58.48 | 1972 | 61.11 | 1971 | 60.554 | 1970 | 59.907 | 1969 | 59.279 | 1968 | 58.273 | 1967 | 57.017 | 1966 | 56.843 | 1965 | 56.382 | 1964 | 55.775 | 1963 | 54.941 | 1962 | 54.346 | 1961 | 53.718 | 1960 | 52.793 |
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