Year | Value | 2021 | 59.325 | 2020 | 61.172 | 2019 | 61.166 | 2018 | 60.526 | 2017 | 59.771 | 2016 | 59.038 | 2015 | 58.151 | 2014 | 57.274 | 2013 | 56.492 | 2012 | 55.639 | 2011 | 54.869 | 2010 | 54.198 | 2009 | 53.788 | 2008 | 53.164 | 2007 | 52.566 | 2006 | 51.961 | 2005 | 51.561 | 2004 | 51.249 | 2003 | 50.87 | 2002 | 50.59 | 2001 | 50.065 | 2000 | 49.491 | 1999 | 48.812 | 1998 | 48.024 | 1997 | 47.408 | 1996 | 46.636 | 1995 | 46.04 | 1994 | 45.606 | 1993 | 45.354 | 1992 | 44.949 | 1991 | 44.66 | 1990 | 44.469 | 1989 | 44.143 | 1988 | 43.844 | 1987 | 40.843 | 1986 | 40.681 | 1985 | 38.657 | 1984 | 38.38 | 1983 | 40.83 | 1982 | 40.703 | 1981 | 40.536 | 1980 | 42.801 | 1979 | 42.744 | 1978 | 42.795 | 1977 | 42.7 | 1976 | 42.635 | 1975 | 42.582 | 1974 | 42.065 | 1973 | 41.707 | 1972 | 41.59 | 1971 | 41.739 | 1970 | 41.755 | 1969 | 41.71 | 1968 | 41.667 | 1967 | 41.663 | 1966 | 41.639 | 1965 | 41.699 | 1964 | 41.67 | 1963 | 41.934 | 1962 | 41.832 | 1961 | 41.59 | 1960 | 41.221 |
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