Year | Value | 2021 | 76.009 | 2020 | 77.375 | 2019 | 78.469 | 2018 | 78.266 | 2017 | 78.032 | 2016 | 77.848 | 2015 | 77.572 | 2014 | 77.432 | 2013 | 77.12 | 2012 | 76.869 | 2011 | 76.651 | 2010 | 76.592 | 2009 | 76.299 | 2008 | 76.134 | 2007 | 75.88 | 2006 | 75.665 | 2005 | 75.402 | 2004 | 74.916 | 2003 | 74.42 | 2002 | 74.189 | 2001 | 73.969 | 2000 | 73.431 | 1999 | 72.813 | 1998 | 72.432 | 1997 | 72.03 | 1996 | 71.592 | 1995 | 71.089 | 1994 | 70.646 | 1993 | 70.18 | 1992 | 69.775 | 1991 | 69.335 | 1990 | 69.041 | 1989 | 68.532 | 1988 | 68.091 | 1987 | 67.715 | 1986 | 67.209 | 1985 | 66.718 | 1984 | 66.26 | 1983 | 65.778 | 1982 | 65.288 | 1981 | 64.741 | 1980 | 64.179 | 1979 | 63.653 | 1978 | 63.147 | 1977 | 62.685 | 1976 | 62.224 | 1975 | 61.816 | 1974 | 61.364 | 1973 | 61.022 | 1972 | 60.582 | 1971 | 60.155 | 1970 | 59.73 | 1969 | 59.321 | 1968 | 58.92 | 1967 | 58.477 | 1966 | 58.078 | 1965 | 57.691 | 1964 | 57.223 | 1963 | 56.776 | 1962 | 56.268 | 1961 | 55.782 | 1960 | 55.241 |
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