Year | Value | 2022 | 49.331 | 2021 | 48.92 | 2020 | 48.515 | 2019 | 48.116 | 2018 | 47.723 | 2017 | 47.337 | 2016 | 46.957 | 2015 | 46.583 | 2014 | 46.216 | 2013 | 45.856 | 2012 | 45.502 | 2011 | 45.154 | 2010 | 44.814 | 2009 | 44.479 | 2008 | 44.152 | 2007 | 43.831 | 2006 | 43.517 | 2005 | 43.21 | 2004 | 42.909 | 2003 | 42.615 | 2002 | 42.328 | 2001 | 42.048 | 2000 | 41.774 | 1999 | 41.5 | 1998 | 41.228 | 1997 | 40.955 | 1996 | 40.684 | 1995 | 40.413 | 1994 | 40.142 | 1993 | 39.872 | 1992 | 39.603 | 1991 | 39.334 | 1990 | 37.814 | 1989 | 36.123 | 1988 | 34.468 | 1987 | 32.846 | 1986 | 31.266 | 1985 | 29.728 | 1984 | 28.237 | 1983 | 26.788 | 1982 | 25.389 | 1981 | 24.039 | 1980 | 22.741 | 1979 | 21.992 | 1978 | 21.34 | 1977 | 20.703 | 1976 | 20.081 | 1975 | 19.47 | 1974 | 18.875 | 1973 | 18.294 | 1972 | 17.728 | 1971 | 17.174 | 1970 | 16.635 | 1969 | 16.135 | 1968 | 15.657 | 1967 | 15.188 | 1966 | 14.732 | 1965 | 14.287 | 1964 | 13.854 | 1963 | 13.43 | 1962 | 13.019 | 1961 | 12.618 | 1960 | 12.228 |
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