Year | Value | 2021 | 74.879 | 2020 | 73.082 | 2019 | 75.238 | 2018 | 74.966 | 2017 | 74.7 | 2016 | 74.693 | 2015 | 74.456 | 2014 | 73.803 | 2013 | 73.43 | 2012 | 72.971 | 2011 | 73.04 | 2010 | 72.769 | 2009 | 72.413 | 2008 | 71.841 | 2007 | 71.499 | 2006 | 71.313 | 2005 | 71.069 | 2004 | 70.735 | 2003 | 70.344 | 2002 | 69.943 | 2001 | 69.498 | 2000 | 69.068 | 1999 | 68.703 | 1998 | 67.744 | 1997 | 67.49 | 1996 | 67.134 | 1995 | 65.489 | 1994 | 65.621 | 1993 | 66.263 | 1992 | 66.238 | 1991 | 66.378 | 1990 | 66.313 | 1989 | 66.064 | 1988 | 66.034 | 1987 | 64.439 | 1986 | 63.462 | 1985 | 62.027 | 1984 | 60.102 | 1983 | 57.835 | 1982 | 55.806 | 1981 | 53.846 | 1980 | 51.983 | 1979 | 50.657 | 1978 | 49.38 | 1977 | 48.302 | 1976 | 47.236 | 1975 | 46.294 | 1974 | 45.372 | 1973 | 44.583 | 1972 | 43.834 | 1971 | 43.205 | 1970 | 42.712 | 1969 | 42.343 | 1968 | 42.221 | 1967 | 42.108 | 1966 | 42.062 | 1965 | 42.164 | 1964 | 42.224 | 1963 | 42.339 | 1962 | 36.548 | 1961 | 37.941 | 1960 | 37.881 |
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