Year | Value | 2022 | 40.744 | 2021 | 41.005 | 2020 | 41.252 | 2019 | 41.485 | 2018 | 41.703 | 2017 | 41.906 | 2016 | 42.095 | 2015 | 42.285 | 2014 | 42.474 | 2013 | 42.664 | 2012 | 42.853 | 2011 | 42.885 | 2010 | 42.601 | 2009 | 42.317 | 2008 | 42.034 | 2007 | 41.751 | 2006 | 41.468 | 2005 | 41.187 | 2004 | 40.906 | 2003 | 40.625 | 2002 | 40.345 | 2001 | 40.066 | 2000 | 39.787 | 1999 | 39.509 | 1998 | 39.232 | 1997 | 38.955 | 1996 | 38.68 | 1995 | 38.404 | 1994 | 38.13 | 1993 | 37.856 | 1992 | 37.583 | 1991 | 37.311 | 1990 | 37.04 | 1989 | 36.769 | 1988 | 36.5 | 1987 | 36.231 | 1986 | 35.963 | 1985 | 35.695 | 1984 | 35.43 | 1983 | 35.164 | 1982 | 34.9 | 1981 | 34.636 | 1980 | 34.609 | 1979 | 34.619 | 1978 | 34.629 | 1977 | 34.639 | 1976 | 34.649 | 1975 | 34.659 | 1974 | 34.669 | 1973 | 34.679 | 1972 | 34.689 | 1971 | 34.699 | 1970 | 34.742 | 1969 | 34.792 | 1968 | 34.841 | 1967 | 34.89 | 1966 | 34.939 | 1965 | 34.989 | 1964 | 35.038 | 1963 | 35.087 | 1962 | 35.137 | 1961 | 35.186 | 1960 | 35.28 |
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