Year | Value | 2021 | 79.209 | 2020 | 79.345 | 2019 | 79.508 | 2018 | 79.67 | 2017 | 79.246 | 2016 | 78.945 | 2015 | 79.051 | 2014 | 78.817 | 2013 | 78.409 | 2012 | 78.091 | 2011 | 77.736 | 2010 | 77.362 | 2009 | 77.109 | 2008 | 76.813 | 2007 | 76.656 | 2006 | 76.255 | 2005 | 75.953 | 2004 | 75.815 | 2003 | 75.621 | 2002 | 75.37 | 2001 | 74.977 | 2000 | 74.601 | 1999 | 74.255 | 1998 | 74 | 1997 | 73.763 | 1996 | 73.509 | 1995 | 73.142 | 1994 | 72.932 | 1993 | 72.627 | 1992 | 72.255 | 1991 | 71.975 | 1990 | 71.722 | 1989 | 71.445 | 1988 | 71.048 | 1987 | 71.037 | 1986 | 70.768 | 1985 | 70.505 | 1984 | 70.151 | 1983 | 70.196 | 1982 | 69.59 | 1981 | 69.573 | 1980 | 69.498 | 1979 | 69.439 | 1978 | 69.209 | 1977 | 68.638 | 1976 | 68.401 | 1975 | 67.781 | 1974 | 44.709 | 1973 | 67.368 | 1972 | 66.861 | 1971 | 66.473 | 1970 | 66.003 | 1969 | 65.551 | 1968 | 65.344 | 1967 | 64.822 | 1966 | 64.47 | 1965 | 63.95 | 1964 | 58.669 | 1963 | 58.151 | 1962 | 62.121 | 1961 | 61.464 | 1960 | 60.809 |
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