Year | Value | 2022 | 81.752 | 2021 | 81.653 | 2020 | 81.562 | 2019 | 81.482 | 2018 | 81.411 | 2017 | 81.35 | 2016 | 81.3 | 2015 | 81.259 | 2014 | 81.218 | 2013 | 81.178 | 2012 | 81.137 | 2011 | 81.096 | 2010 | 80.937 | 2009 | 80.758 | 2008 | 80.578 | 2007 | 80.396 | 2006 | 80.213 | 2005 | 80.122 | 2004 | 80.045 | 2003 | 79.967 | 2002 | 79.888 | 2001 | 79.81 | 2000 | 79.478 | 1999 | 79.103 | 1998 | 78.724 | 1997 | 78.34 | 1996 | 77.951 | 1995 | 77.675 | 1994 | 77.414 | 1993 | 77.152 | 1992 | 76.887 | 1991 | 76.62 | 1990 | 76.582 | 1989 | 76.562 | 1988 | 76.542 | 1987 | 76.522 | 1986 | 76.502 | 1985 | 76.354 | 1984 | 76.195 | 1983 | 76.035 | 1982 | 75.874 | 1981 | 75.712 | 1980 | 75.663 | 1979 | 75.623 | 1978 | 75.583 | 1977 | 75.543 | 1976 | 75.503 | 1975 | 75.611 | 1974 | 75.731 | 1973 | 75.851 | 1972 | 75.971 | 1971 | 76.09 | 1970 | 75.654 | 1969 | 75.161 | 1968 | 74.662 | 1967 | 74.155 | 1966 | 73.642 | 1965 | 72.892 | 1964 | 72.107 | 1963 | 71.307 | 1962 | 70.494 | 1961 | 69.668 | 1960 | 69.061 |
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