Year | Value | 2021 | 77.362 | 2020 | 78.472 | 2019 | 78.306 | 2018 | 78.267 | 2017 | 78.139 | 2016 | 77.938 | 2015 | 77.728 | 2014 | 77.677 | 2013 | 77.618 | 2012 | 77.598 | 2011 | 77.485 | 2010 | 77.124 | 2009 | 76.79 | 2008 | 76.576 | 2007 | 76.474 | 2006 | 76.432 | 2005 | 76.437 | 2004 | 76.276 | 2003 | 76.194 | 2002 | 75.857 | 2001 | 75.66 | 2000 | 75.11 | 1999 | 74.664 | 1998 | 74.542 | 1997 | 74.64 | 1996 | 74.65 | 1995 | 74.692 | 1994 | 74.442 | 1993 | 74.092 | 1992 | 73.875 | 1991 | 73.671 | 1990 | 73.525 | 1989 | 73.383 | 1988 | 73.17 | 1987 | 72.924 | 1986 | 72.706 | 1985 | 72.447 | 1984 | 72.14 | 1983 | 71.741 | 1982 | 71.383 | 1981 | 71.003 | 1980 | 70.323 | 1979 | 69.763 | 1978 | 69.291 | 1977 | 68.805 | 1976 | 67.874 | 1975 | 67.311 | 1974 | 66.775 | 1973 | 66.149 | 1972 | 65.601 | 1971 | 65.077 | 1970 | 64.594 | 1969 | 64.127 | 1968 | 63.69 | 1967 | 63.231 | 1966 | 62.847 | 1965 | 62.501 | 1964 | 61.513 | 1963 | 60.646 | 1962 | 59.769 | 1961 | 58.842 | 1960 | 57.902 |
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