Year | Value | 2021 | 33.194 | 2020 | 33.427 | 2019 | 33.723 | 2018 | 34.183 | 2017 | 34.425 | 2016 | 34.832 | 2015 | 35.18 | 2014 | 35.527 | 2013 | 35.834 | 2012 | 36.398 | 2011 | 36.712 | 2010 | 36.772 | 2009 | 36.947 | 2008 | 37.247 | 2007 | 37.064 | 2006 | 37.1 | 2005 | 36.923 | 2004 | 36.776 | 2003 | 36.715 | 2002 | 36.996 | 2001 | 37.502 | 2000 | 37.792 | 1999 | 38.236 | 1998 | 38.44 | 1997 | 39.005 | 1996 | 39.643 | 1995 | 40.733 | 1994 | 40.936 | 1993 | 41.452 | 1992 | 40.643 | 1991 | 40.62 | 1990 | 40.607 | 1989 | 40.748 | 1988 | 40.7 | 1987 | 40.975 | 1986 | 41.369 | 1985 | 41.936 | 1984 | 42.453 | 1983 | 42.911 | 1982 | 43.308 | 1981 | 43.709 | 1980 | 43.751 | 1979 | 43.847 | 1978 | 44.325 | 1977 | 44.562 | 1976 | 44.718 | 1975 | 44.905 | 1974 | 45.102 | 1973 | 45.25 | 1972 | 45.451 | 1971 | 45.64 | 1970 | 45.957 | 1969 | 46.263 | 1968 | 46.522 | 1967 | 46.843 | 1966 | 46.96 | 1965 | 46.918 | 1964 | 46.763 | 1963 | 46.718 | 1962 | 46.604 | 1961 | 46.571 | 1960 | 46.34 |
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