Year | Value | 2022 | 81.427 | 2021 | 81.414 | 2020 | 81.414 | 2019 | 81.43 | 2018 | 81.459 | 2017 | 81.503 | 2016 | 81.562 | 2015 | 81.634 | 2014 | 81.707 | 2013 | 81.779 | 2012 | 81.851 | 2011 | 81.923 | 2010 | 81.936 | 2009 | 81.835 | 2008 | 81.733 | 2007 | 81.631 | 2006 | 81.528 | 2005 | 81.345 | 2004 | 81.002 | 2003 | 80.652 | 2002 | 80.299 | 2001 | 79.94 | 2000 | 79.621 | 1999 | 79.384 | 1998 | 79.145 | 1997 | 78.905 | 1996 | 78.662 | 1995 | 78.239 | 1994 | 77.452 | 1993 | 76.645 | 1992 | 75.82 | 1991 | 74.972 | 1990 | 73.844 | 1989 | 72.148 | 1988 | 70.389 | 1987 | 68.563 | 1986 | 66.679 | 1985 | 64.876 | 1984 | 63.301 | 1983 | 61.693 | 1982 | 60.061 | 1981 | 58.407 | 1980 | 56.72 | 1979 | 54.981 | 1978 | 53.233 | 1977 | 51.476 | 1976 | 49.719 | 1975 | 48.033 | 1974 | 46.579 | 1973 | 45.131 | 1972 | 43.692 | 1971 | 42.261 | 1970 | 40.704 | 1969 | 38.756 | 1968 | 36.846 | 1967 | 34.971 | 1966 | 33.347 | 1965 | 32.351 | 1964 | 31.372 | 1963 | 30.407 | 1962 | 29.461 | 1961 | 28.531 | 1960 | 27.71 |
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