Year | Value | 2021 | 57.066 | 2020 | 59.692 | 2019 | 60.549 | 2018 | 59.411 | 2017 | 57.895 | 2016 | 56.659 | 2015 | 55.019 | 2014 | 53.05 | 2013 | 51.486 | 2012 | 49.835 | 2011 | 48.195 | 2010 | 46.619 | 2009 | 44.639 | 2008 | 44.175 | 2007 | 43.641 | 2006 | 43.12 | 2005 | 42.125 | 2004 | 42.538 | 2003 | 43.349 | 2002 | 44.486 | 2001 | 45.975 | 2000 | 47.256 | 1999 | 48.733 | 1998 | 50.333 | 1997 | 52.044 | 1996 | 53.873 | 1995 | 56.148 | 1994 | 58.268 | 1993 | 60.233 | 1992 | 61.735 | 1991 | 62.685 | 1990 | 63.072 | 1989 | 62.927 | 1988 | 62.673 | 1987 | 62.042 | 1986 | 61.438 | 1985 | 60.785 | 1984 | 59.999 | 1983 | 58.172 | 1982 | 59.02 | 1981 | 58.392 | 1980 | 57.846 | 1979 | 57.268 | 1978 | 56.477 | 1977 | 55.598 | 1976 | 54.658 | 1975 | 53.824 | 1974 | 53.086 | 1973 | 52.468 | 1972 | 51.821 | 1971 | 51.31 | 1970 | 50.804 | 1969 | 50.318 | 1968 | 49.748 | 1967 | 49.128 | 1966 | 48.56 | 1965 | 47.907 | 1964 | 47.335 | 1963 | 46.854 | 1962 | 46.614 | 1961 | 46.191 | 1960 | 45.813 |
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