Year | Value | 2021 | 33.257 | 2020 | 33.719 | 2019 | 34.281 | 2018 | 34.924 | 2017 | 35.743 | 2016 | 36.59 | 2015 | 37.576 | 2014 | 38.486 | 2013 | 39.398 | 2012 | 40.136 | 2011 | 40.69 | 2010 | 41.084 | 2009 | 41.469 | 2008 | 41.757 | 2007 | 42.086 | 2006 | 42.366 | 2005 | 42.138 | 2004 | 42.201 | 2003 | 42.253 | 2002 | 42.519 | 2001 | 42.921 | 2000 | 43.146 | 1999 | 43.599 | 1998 | 44.075 | 1997 | 44.095 | 1996 | 44.277 | 1995 | 44.67 | 1994 | 44.978 | 1993 | 45.145 | 1992 | 45.383 | 1991 | 45.597 | 1990 | 45.733 | 1989 | 45.848 | 1988 | 46.095 | 1987 | 46.226 | 1986 | 46.401 | 1985 | 46.398 | 1984 | 46.547 | 1983 | 46.629 | 1982 | 46.753 | 1981 | 46.745 | 1980 | 46.742 | 1979 | 46.789 | 1978 | 46.935 | 1977 | 47.074 | 1976 | 47.287 | 1975 | 47.386 | 1974 | 47.552 | 1973 | 47.766 | 1972 | 47.775 | 1971 | 47.753 | 1970 | 47.913 | 1969 | 48.156 | 1968 | 48.351 | 1967 | 48.64 | 1966 | 48.889 | 1965 | 49.385 | 1964 | 49.792 | 1963 | 50.136 | 1962 | 50.411 | 1961 | 50.605 | 1960 | 50.742 |
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