Year | Value | 2022 | 25.623 | 2021 | 25.786 | 2020 | 25.939 | 2019 | 26.079 | 2018 | 26.208 | 2017 | 26.325 | 2016 | 26.43 | 2015 | 26.523 | 2014 | 26.616 | 2013 | 26.71 | 2012 | 26.803 | 2011 | 26.815 | 2010 | 26.745 | 2009 | 26.676 | 2008 | 26.606 | 2007 | 26.537 | 2006 | 26.467 | 2005 | 26.398 | 2004 | 26.329 | 2003 | 26.26 | 2002 | 26.191 | 2001 | 26.123 | 2000 | 26.012 | 1999 | 25.88 | 1998 | 25.749 | 1997 | 25.618 | 1996 | 25.487 | 1995 | 25.357 | 1994 | 25.228 | 1993 | 25.099 | 1992 | 24.97 | 1991 | 24.842 | 1990 | 24.78 | 1989 | 24.751 | 1988 | 24.722 | 1987 | 24.693 | 1986 | 24.664 | 1985 | 24.635 | 1984 | 24.606 | 1983 | 24.577 | 1982 | 24.548 | 1981 | 24.519 | 1980 | 24.833 | 1979 | 25.833 | 1978 | 26.858 | 1977 | 27.908 | 1976 | 28.982 | 1975 | 30.083 | 1974 | 31.206 | 1973 | 32.351 | 1972 | 33.516 | 1971 | 34.705 | 1970 | 35.598 | 1969 | 36.07 | 1968 | 36.544 | 1967 | 37.022 | 1966 | 37.502 | 1965 | 37.984 | 1964 | 38.468 | 1963 | 38.956 | 1962 | 39.445 | 1961 | 39.937 | 1960 | 40.452 |
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