Year | Value | 2021 | 76.377 | 2020 | 74.453 | 2019 | 76.474 | 2018 | 76.066 | 2017 | 75.743 | 2016 | 75.732 | 2015 | 75.622 | 2014 | 75.11 | 2013 | 74.615 | 2012 | 74.202 | 2011 | 74.123 | 2010 | 73.808 | 2009 | 73.62 | 2008 | 72.941 | 2007 | 72.602 | 2006 | 72.334 | 2005 | 72.061 | 2004 | 71.762 | 2003 | 71.287 | 2002 | 71.23 | 2001 | 70.823 | 2000 | 70.478 | 1999 | 70.032 | 1998 | 69.451 | 1997 | 69.171 | 1996 | 68.749 | 1995 | 67.454 | 1994 | 67.361 | 1993 | 67.719 | 1992 | 67.757 | 1991 | 67.688 | 1990 | 67.416 | 1989 | 67.085 | 1988 | 66.971 | 1987 | 65.83 | 1986 | 65.159 | 1985 | 63.588 | 1984 | 61.658 | 1983 | 59.51 | 1982 | 57.428 | 1981 | 55.276 | 1980 | 53.261 | 1979 | 51.755 | 1978 | 50.353 | 1977 | 49.191 | 1976 | 47.985 | 1975 | 46.972 | 1974 | 46.034 | 1973 | 45.079 | 1972 | 44.346 | 1971 | 43.67 | 1970 | 43.16 | 1969 | 42.781 | 1968 | 42.642 | 1967 | 42.568 | 1966 | 42.543 | 1965 | 42.714 | 1964 | 42.788 | 1963 | 42.908 | 1962 | 39.323 | 1961 | 40.516 | 1960 | 40.532 |
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