Year | Value | 2022 | 49.534 | 2021 | 48.972 | 2020 | 48.415 | 2019 | 47.861 | 2018 | 47.312 | 2017 | 46.768 | 2016 | 46.229 | 2015 | 45.695 | 2014 | 45.166 | 2013 | 44.642 | 2012 | 44.125 | 2011 | 43.608 | 2010 | 43.093 | 2009 | 42.58 | 2008 | 42.069 | 2007 | 41.558 | 2006 | 41.049 | 2005 | 40.543 | 2004 | 40.039 | 2003 | 39.536 | 2002 | 39.036 | 2001 | 38.65 | 2000 | 38.333 | 1999 | 38.015 | 1998 | 37.699 | 1997 | 37.385 | 1996 | 37.071 | 1995 | 36.758 | 1994 | 36.447 | 1993 | 36.136 | 1992 | 35.827 | 1991 | 35.247 | 1990 | 34.485 | 1989 | 33.73 | 1988 | 32.985 | 1987 | 32.246 | 1986 | 31.517 | 1985 | 30.796 | 1984 | 30.086 | 1983 | 29.384 | 1982 | 28.692 | 1981 | 28.01 | 1980 | 27.339 | 1979 | 26.676 | 1978 | 25.552 | 1977 | 24.293 | 1976 | 23.079 | 1975 | 21.904 | 1974 | 20.775 | 1973 | 19.689 | 1972 | 18.648 | 1971 | 17.647 | 1970 | 16.691 | 1969 | 15.776 | 1968 | 14.903 | 1967 | 14.069 | 1966 | 13.275 | 1965 | 12.519 | 1964 | 11.801 | 1963 | 11.118 | 1962 | 10.47 | 1961 | 9.856 | 1960 | 9.275 |
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