Year | Value | 2021 | 69.568 | 2020 | 65.999 | 2019 | 68.862 | 2018 | 68.272 | 2017 | 67.682 | 2016 | 67.254 | 2015 | 66.996 | 2014 | 66.751 | 2013 | 66.662 | 2012 | 66.247 | 2011 | 65.728 | 2010 | 65.365 | 2009 | 65.776 | 2008 | 65.455 | 2007 | 64.926 | 2006 | 64.676 | 2005 | 64.202 | 2004 | 63.685 | 2003 | 63.318 | 2002 | 62.566 | 2001 | 61.823 | 2000 | 60.697 | 1999 | 60.095 | 1998 | 58.684 | 1997 | 57.446 | 1996 | 56.012 | 1995 | 56.115 | 1994 | 53.142 | 1993 | 45.771 | 1992 | 49.109 | 1991 | 58.572 | 1990 | 59.183 | 1989 | 59.337 | 1988 | 59.173 | 1987 | 58.996 | 1986 | 58.535 | 1985 | 57.947 | 1984 | 57.612 | 1983 | 57.394 | 1982 | 57.367 | 1981 | 57.129 | 1980 | 57.231 | 1979 | 57.271 | 1978 | 57.324 | 1977 | 57.153 | 1976 | 56.977 | 1975 | 56.697 | 1974 | 56.22 | 1973 | 55.721 | 1972 | 55.216 | 1971 | 54.791 | 1970 | 54.364 | 1969 | 54.023 | 1968 | 53.666 | 1967 | 53.242 | 1966 | 52.919 | 1965 | 52.779 | 1964 | 52.464 | 1963 | 52.196 | 1962 | 51.89 | 1961 | 51.681 | 1960 | 51.261 |
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