Year | Value | 2021 | 71.598 | 2020 | 72.677 | 2019 | 71.205 | 2018 | 73.806 | 2017 | 73.632 | 2016 | 73.537 | 2015 | 73.104 | 2014 | 73.366 | 2013 | 73.024 | 2012 | 72.753 | 2011 | 72.564 | 2010 | 72.731 | 2009 | 72.579 | 2008 | 72.667 | 2007 | 72.678 | 2006 | 72.855 | 2005 | 72.765 | 2004 | 72.478 | 2003 | 72.402 | 2002 | 72.232 | 2001 | 72.11 | 2000 | 72.041 | 1999 | 71.771 | 1998 | 71.456 | 1997 | 71.054 | 1996 | 70.71 | 1995 | 70.763 | 1994 | 70.851 | 1993 | 70.656 | 1992 | 70.668 | 1991 | 69.616 | 1990 | 70.133 | 1989 | 69.598 | 1988 | 69.215 | 1987 | 68.924 | 1986 | 69.285 | 1985 | 69.257 | 1984 | 69.351 | 1983 | 69.161 | 1982 | 68.436 | 1981 | 67.746 | 1980 | 67.521 | 1979 | 67.366 | 1978 | 67.562 | 1977 | 67.88 | 1976 | 67.84 | 1975 | 67.221 | 1974 | 67.001 | 1973 | 66.488 | 1972 | 66.413 | 1971 | 66.151 | 1970 | 65.926 | 1969 | 65.646 | 1968 | 65.328 | 1967 | 64.948 | 1966 | 64.659 | 1965 | 64.362 | 1964 | 64.05 | 1963 | 63.732 | 1962 | 63.433 | 1961 | 63.185 | 1960 | 62.896 |
|