Year | Value | 2021 | 67.119 | 2020 | 69.564 | 2019 | 71.062 | 2018 | 70.84 | 2017 | 70.731 | 2016 | 70.584 | 2015 | 70.357 | 2014 | 70.674 | 2013 | 71.35 | 2012 | 70.714 | 2011 | 70.019 | 2010 | 69.588 | 2009 | 69.175 | 2008 | 68.618 | 2007 | 68.168 | 2006 | 67.717 | 2005 | 67.177 | 2004 | 66.893 | 2003 | 66.518 | 2002 | 66.306 | 2001 | 66.057 | 2000 | 66.338 | 1999 | 66.591 | 1998 | 66.536 | 1997 | 67.187 | 1996 | 67.671 | 1995 | 67.978 | 1994 | 68.351 | 1993 | 68.474 | 1992 | 68.614 | 1991 | 68.721 | 1990 | 69.139 | 1989 | 68.803 | 1988 | 69.131 | 1987 | 68.458 | 1986 | 67.988 | 1985 | 68.278 | 1984 | 66.839 | 1983 | 66.738 | 1982 | 66.797 | 1981 | 66.699 | 1980 | 66.267 | 1979 | 65.701 | 1978 | 65.096 | 1977 | 64.594 | 1976 | 64.52 | 1975 | 64.58 | 1974 | 63.492 | 1973 | 62.843 | 1972 | 63.152 | 1971 | 62.905 | 1970 | 61.72 | 1969 | 61.087 | 1968 | 60.515 | 1967 | 59.631 | 1966 | 59.228 | 1965 | 58.99 | 1964 | 58.26 | 1963 | 57.607 | 1962 | 56.989 | 1961 | 52.522 | 1960 | 56.016 |
|