Year | Value | 2021 | 74.256 | 2020 | 75.184 | 2019 | 76.044 | 2018 | 75.774 | 2017 | 75.502 | 2016 | 75.215 | 2015 | 75.011 | 2014 | 74.789 | 2013 | 74.562 | 2012 | 74.366 | 2011 | 74.189 | 2010 | 74 | 2009 | 73.801 | 2008 | 73.591 | 2007 | 73.373 | 2006 | 73.145 | 2005 | 72.932 | 2004 | 72.772 | 2003 | 72.573 | 2002 | 72.359 | 2001 | 72.147 | 2000 | 71.918 | 1999 | 71.694 | 1998 | 71.474 | 1997 | 71.272 | 1996 | 71.064 | 1995 | 70.87 | 1994 | 70.699 | 1993 | 70.518 | 1992 | 70.316 | 1991 | 70.093 | 1990 | 69.854 | 1989 | 69.57 | 1988 | 69.252 | 1987 | 68.884 | 1986 | 68.567 | 1985 | 68.26 | 1984 | 67.925 | 1983 | 67.555 | 1982 | 67.154 | 1981 | 66.714 | 1980 | 66.259 | 1979 | 65.851 | 1978 | 65.436 | 1977 | 64.981 | 1976 | 64.49 | 1975 | 63.961 | 1974 | 63.434 | 1973 | 62.908 | 1972 | 62.349 | 1971 | 61.612 | 1970 | 59.87 | 1969 | 60.444 | 1968 | 59.752 | 1967 | 59.01 | 1966 | 57.869 | 1965 | 57.415 | 1964 | 56.559 | 1963 | 55.575 | 1962 | 54.658 | 1961 | 53.671 | 1960 | 52.617 |
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