Year | Value | 2021 | 79.502 | 2020 | 80.111 | 2019 | 79.743 | 2018 | 79.493 | 2017 | 79.317 | 2016 | 79.355 | 2015 | 78.971 | 2014 | 78.813 | 2013 | 78.619 | 2012 | 78.147 | 2011 | 77.801 | 2010 | 77.596 | 2009 | 74.839 | 2008 | 77.5 | 2007 | 77.259 | 2006 | 77.11 | 2005 | 76.667 | 2004 | 70.576 | 2003 | 76.033 | 2002 | 75.835 | 2001 | 75.608 | 2000 | 75.11 | 1999 | 77.6 | 1998 | 77.41 | 1997 | 77.491 | 1996 | 77.451 | 1995 | 77.578 | 1994 | 77.66 | 1993 | 77.708 | 1992 | 77.51 | 1991 | 77.205 | 1990 | 77.081 | 1989 | 75.537 | 1988 | 76.486 | 1987 | 76.05 | 1986 | 75.517 | 1985 | 74.868 | 1984 | 74.397 | 1983 | 73.525 | 1982 | 73.001 | 1981 | 72.525 | 1980 | 71.868 | 1979 | 71.231 | 1978 | 70.111 | 1977 | 69.147 | 1976 | 69.111 | 1975 | 68.847 | 1974 | 68.568 | 1973 | 68.493 | 1972 | 68.366 | 1971 | 68.467 | 1970 | 68.015 | 1969 | 67.081 | 1968 | 66.701 | 1967 | 66.439 | 1966 | 65.666 | 1965 | 65.161 | 1964 | 64.46 | 1963 | 64.213 | 1962 | 63.819 | 1961 | 63.47 | 1960 | 62.751 |
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