Year | Value | 2022 | 53.521 | 2021 | 52.746 | 2020 | 51.958 | 2019 | 51.157 | 2018 | 50.344 | 2017 | 49.519 | 2016 | 48.683 | 2015 | 47.838 | 2014 | 46.982 | 2013 | 46.118 | 2012 | 45.246 | 2011 | 44.366 | 2010 | 43.48 | 2009 | 42.588 | 2008 | 41.702 | 2007 | 40.819 | 2006 | 39.943 | 2005 | 39.074 | 2004 | 38.212 | 2003 | 37.356 | 2002 | 36.508 | 2001 | 35.669 | 2000 | 34.84 | 1999 | 34.304 | 1998 | 33.773 | 1997 | 33.247 | 1996 | 32.725 | 1995 | 32.205 | 1994 | 31.691 | 1993 | 31.182 | 1992 | 30.677 | 1991 | 30.176 | 1990 | 29.68 | 1989 | 28.842 | 1988 | 28.019 | 1987 | 27.209 | 1986 | 26.414 | 1985 | 25.635 | 1984 | 24.872 | 1983 | 24.122 | 1982 | 23.389 | 1981 | 22.671 | 1980 | 21.97 | 1979 | 21.518 | 1978 | 21.074 | 1977 | 20.636 | 1976 | 20.205 | 1975 | 19.78 | 1974 | 19.363 | 1973 | 18.952 | 1972 | 18.549 | 1971 | 18.151 | 1970 | 17.76 | 1969 | 17.513 | 1968 | 17.269 | 1967 | 17.027 | 1966 | 16.788 | 1965 | 16.551 | 1964 | 16.318 | 1963 | 16.087 | 1962 | 15.858 | 1961 | 15.633 | 1960 | 15.41 |
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