Year | Value | 2021 | 60.747 | 2020 | 60.948 | 2019 | 61.104 | 2018 | 60.853 | 2017 | 60.553 | 2016 | 60.416 | 2015 | 59.148 | 2014 | 59.121 | 2013 | 59.943 | 2012 | 59.913 | 2011 | 59.62 | 2010 | 59.433 | 2009 | 59.194 | 2008 | 58.772 | 2007 | 58.285 | 2006 | 57.62 | 2005 | 56.912 | 2004 | 56.013 | 2003 | 53.042 | 2002 | 53.788 | 2001 | 52.752 | 2000 | 51.356 | 1999 | 49.953 | 1998 | 48.901 | 1997 | 47.847 | 1996 | 44.419 | 1995 | 43.917 | 1994 | 41.796 | 1993 | 42.166 | 1992 | 42.738 | 1991 | 42.795 | 1990 | 36.688 | 1989 | 43.451 | 1988 | 43.993 | 1987 | 44.528 | 1986 | 45.005 | 1985 | 44.664 | 1984 | 45.436 | 1983 | 45.383 | 1982 | 45.204 | 1981 | 44.983 | 1980 | 44.631 | 1979 | 44.349 | 1978 | 44.046 | 1977 | 43.619 | 1976 | 43.183 | 1975 | 42.774 | 1974 | 42.383 | 1973 | 41.91 | 1972 | 41.482 | 1971 | 40.94 | 1970 | 40.599 | 1969 | 40.193 | 1968 | 39.764 | 1967 | 39.427 | 1966 | 39.081 | 1965 | 38.812 | 1964 | 38.607 | 1963 | 38.473 | 1962 | 38.402 | 1961 | 38.333 | 1960 | 38.33 |
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