Year | Value | 2021 | 73.67 | 2020 | 72.153 | 2019 | 77.297 | 2018 | 77.094 | 2017 | 76.972 | 2016 | 76.763 | 2015 | 76.789 | 2014 | 76.622 | 2013 | 76.369 | 2012 | 76.062 | 2011 | 75.743 | 2010 | 75.43 | 2009 | 75.184 | 2008 | 74.983 | 2007 | 74.844 | 2006 | 74.689 | 2005 | 74.514 | 2004 | 74.279 | 2003 | 73.975 | 2002 | 73.613 | 2001 | 73.24 | 2000 | 72.839 | 1999 | 72.463 | 1998 | 72.045 | 1997 | 71.681 | 1996 | 71.362 | 1995 | 71.041 | 1994 | 70.757 | 1993 | 70.345 | 1992 | 70.117 | 1991 | 69.625 | 1990 | 69.348 | 1989 | 68.749 | 1988 | 68.056 | 1987 | 67.3 | 1986 | 66.535 | 1985 | 65.811 | 1984 | 65.171 | 1983 | 64.528 | 1982 | 64.11 | 1981 | 63.662 | 1980 | 63.191 | 1979 | 62.696 | 1978 | 62.153 | 1977 | 61.559 | 1976 | 60.89 | 1975 | 60.232 | 1974 | 59.526 | 1973 | 58.837 | 1972 | 58.205 | 1971 | 57.633 | 1970 | 57.152 | 1969 | 56.654 | 1968 | 56.487 | 1967 | 56.213 | 1966 | 55.942 | 1965 | 55.664 | 1964 | 55.305 | 1963 | 54.88 | 1962 | 54.401 | 1961 | 53.895 | 1960 | 53.364 |
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