Year | Value | 2022 | 24.346 | 2021 | 24.38 | 2020 | 24.433 | 2019 | 24.506 | 2018 | 24.599 | 2017 | 24.713 | 2016 | 24.846 | 2015 | 25 | 2014 | 25.175 | 2013 | 25.35 | 2012 | 25.526 | 2011 | 25.703 | 2010 | 26.238 | 2009 | 26.818 | 2008 | 27.405 | 2007 | 28.002 | 2006 | 28.606 | 2005 | 29.218 | 2004 | 29.837 | 2003 | 30.464 | 2002 | 31.098 | 2001 | 31.74 | 2000 | 32.127 | 1999 | 32.49 | 1998 | 32.855 | 1997 | 33.221 | 1996 | 33.59 | 1995 | 33.961 | 1994 | 34.334 | 1993 | 34.709 | 1992 | 35.085 | 1991 | 35.465 | 1990 | 35.426 | 1989 | 35.345 | 1988 | 35.264 | 1987 | 35.183 | 1986 | 35.102 | 1985 | 35.021 | 1984 | 34.94 | 1983 | 34.86 | 1982 | 34.779 | 1981 | 34.698 | 1980 | 34.618 | 1979 | 34.538 | 1978 | 34.457 | 1977 | 34.377 | 1976 | 34.297 | 1975 | 34.217 | 1974 | 34.137 | 1973 | 34.057 | 1972 | 33.978 | 1971 | 33.898 | 1970 | 33.819 | 1969 | 34.245 | 1968 | 34.829 | 1967 | 35.418 | 1966 | 36.012 | 1965 | 36.61 | 1964 | 37.211 | 1963 | 37.817 | 1962 | 38.427 | 1961 | 39.04 | 1960 | 39.656 |
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