Year | Value | 2021 | 35.05871217645 | 2020 | 35.435558780307 | 2019 | 35.835257379736 | 2018 | 36.152451101987 | 2017 | 36.495328496392 | 2016 | 36.895002161745 | 2015 | 37.306716349869 | 2014 | 37.642228550035 | 2013 | 38.07061569984 | 2012 | 38.542257342736 | 2011 | 39.068464701735 | 2010 | 39.532569709903 | 2009 | 39.894466229519 | 2008 | 40.249938818403 | 2007 | 40.709566614517 | 2006 | 41.087694393271 | 2005 | 41.365577324449 | 2004 | 41.637550162943 | 2003 | 41.970153895787 | 2002 | 42.339110392708 | 2001 | 42.686461204835 | 2000 | 43.00908258528 | 1999 | 43.343789890499 | 1998 | 43.561209116037 | 1997 | 43.958911970694 | 1996 | 44.353323558724 | 1995 | 44.634217875099 | 1994 | 44.71479573573 | 1993 | 45.113533651404 | 1992 | 45.36881633695 | 1991 | 45.667823989038 | 1990 | 45.914371934048 | 1989 | 46.177864736441 | 1988 | 46.425881683732 | 1987 | 46.752071122965 | 1986 | 46.973485550252 | 1985 | 47.187901496582 | 1984 | 47.318189844786 | 1983 | 47.426537304847 | 1982 | 47.515536379816 | 1981 | 47.669298691084 | 1980 | 47.789735770646 | 1979 | 47.874438487801 | 1978 | 47.846920185831 | 1977 | 47.874544365784 | 1976 | 47.864525835409 | 1975 | 47.92484895789 | 1974 | 47.967325547324 | 1973 | 48.033189955738 | 1972 | 48.18998190586 | 1971 | 48.274413526111 | 1970 | 48.258419485655 | 1969 | 48.276362048415 | 1968 | 48.2307959191 | 1967 | 48.218085390789 | 1966 | 48.202617549596 | 1965 | 48.204539474666 | 1964 | 48.222742835255 | 1963 | 48.238332457259 | 1962 | 48.228532775497 | 1961 | 48.187407001192 | 1960 | 48.170045273323 |
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