Year | Value | 2022 | 81.3 | 2021 | 81.016 | 2020 | 80.731 | 2019 | 80.444 | 2018 | 80.156 | 2017 | 79.867 | 2016 | 79.577 | 2015 | 79.285 | 2014 | 78.993 | 2013 | 78.699 | 2012 | 78.405 | 2011 | 78.111 | 2010 | 77.815 | 2009 | 77.52 | 2008 | 77.222 | 2007 | 76.92 | 2006 | 76.616 | 2005 | 76.308 | 2004 | 75.997 | 2003 | 75.682 | 2002 | 75.365 | 2001 | 75.045 | 2000 | 74.722 | 1999 | 74.441 | 1998 | 74.186 | 1997 | 73.929 | 1996 | 73.67 | 1995 | 73.368 | 1994 | 72.985 | 1993 | 72.598 | 1992 | 72.209 | 1991 | 71.816 | 1990 | 71.419 | 1989 | 70.956 | 1988 | 70.462 | 1987 | 69.963 | 1986 | 69.459 | 1985 | 68.95 | 1984 | 68.437 | 1983 | 67.919 | 1982 | 67.396 | 1981 | 66.87 | 1980 | 66.339 | 1979 | 65.646 | 1978 | 64.934 | 1977 | 64.215 | 1976 | 63.491 | 1975 | 62.759 | 1974 | 62.022 | 1973 | 61.279 | 1972 | 60.532 | 1971 | 59.779 | 1970 | 59.021 | 1969 | 58.229 | 1968 | 57.411 | 1967 | 56.587 | 1966 | 55.761 | 1965 | 54.931 | 1964 | 54.1 | 1963 | 53.265 | 1962 | 52.428 | 1961 | 51.59 | 1960 | 50.753 |
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