Year | Value | 2021 | 72.381 | 2020 | 71.968 | 2019 | 72.806 | 2018 | 72.567 | 2017 | 71.788 | 2016 | 71.09 | 2015 | 70.491 | 2014 | 69.986 | 2013 | 69.565 | 2012 | 69.554 | 2011 | 68.809 | 2010 | 68.638 | 2009 | 67.403 | 2008 | 67.051 | 2007 | 66.714 | 2006 | 67.241 | 2005 | 67.299 | 2004 | 67.187 | 2003 | 66.824 | 2002 | 66.612 | 2001 | 66.135 | 2000 | 65.779 | 1999 | 66.228 | 1998 | 63.917 | 1997 | 61.427 | 1996 | 59.492 | 1995 | 59.467 | 1994 | 58.617 | 1993 | 57.927 | 1992 | 57.635 | 1991 | 54.154 | 1990 | 55.989 | 1989 | 55.089 | 1988 | 55.027 | 1987 | 54.926 | 1986 | 54.415 | 1985 | 53.897 | 1984 | 53.54 | 1983 | 53.011 | 1982 | 52.54 | 1981 | 52.169 | 1980 | 51.85 | 1979 | 51.464 | 1978 | 51.254 | 1977 | 51.197 | 1976 | 50.647 | 1975 | 50.292 | 1974 | 49.16 | 1973 | 49.828 | 1972 | 49.591 | 1971 | 25.996 | 1970 | 42.587 | 1969 | 49.172 | 1968 | 49.09 | 1967 | 48.865 | 1966 | 48.577 | 1965 | 46.858 | 1964 | 47.741 | 1963 | 46.655 | 1962 | 46.701 | 1961 | 45.662 | 1960 | 44.74 |
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