Year | Value | 2022 | 29.786 | 2021 | 30.112 | 2020 | 30.432 | 2019 | 30.746 | 2018 | 31.055 | 2017 | 31.358 | 2016 | 31.654 | 2015 | 31.944 | 2014 | 32.228 | 2013 | 32.505 | 2012 | 32.782 | 2011 | 33.062 | 2010 | 33.343 | 2009 | 33.624 | 2008 | 33.907 | 2007 | 34.191 | 2006 | 34.476 | 2005 | 34.763 | 2004 | 35.05 | 2003 | 35.415 | 2002 | 35.798 | 2001 | 36.182 | 2000 | 36.568 | 1999 | 36.957 | 1998 | 37.347 | 1997 | 37.738 | 1996 | 38.13 | 1995 | 38.526 | 1994 | 38.922 | 1993 | 39.638 | 1992 | 40.438 | 1991 | 41.244 | 1990 | 42.054 | 1989 | 42.869 | 1988 | 43.686 | 1987 | 44.509 | 1986 | 45.333 | 1985 | 46.161 | 1984 | 46.989 | 1983 | 47.644 | 1982 | 48.24 | 1981 | 48.836 | 1980 | 49.431 | 1979 | 50.028 | 1978 | 50.625 | 1977 | 51.221 | 1976 | 51.816 | 1975 | 52.412 | 1974 | 53.21 | 1973 | 54.041 | 1972 | 54.868 | 1971 | 55.695 | 1970 | 56.518 | 1969 | 57.338 | 1968 | 58.152 | 1967 | 58.964 | 1966 | 59.77 | 1965 | 60.276 | 1964 | 60.721 | 1963 | 61.167 | 1962 | 61.609 | 1961 | 62.05 | 1960 | 62.489 |
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