Year | Value | 2021 | 36.784558301097 | 2020 | 36.784558301097 | 2019 | 36.784558301097 | 2018 | 36.784558301097 | 2017 | 36.784558301097 | 2016 | 36.626667719271 | 2015 | 36.074050682877 | 2014 | 36.063787795058 | 2013 | 36.063787795058 | 2012 | 35.353280176838 | 2011 | 35.116444304097 | 2010 | 34.72171784953 | 2009 | 34.563827267704 | 2008 | 34.563827267704 | 2007 | 34.563827267704 | 2006 | 33.93779111076 | 2005 | 33.918844240941 | 2004 | 30.371832320202 | 2003 | 30.324465145654 | 2002 | 29.999210547091 | 2001 | 29.999210547091 | 2000 | 29.209757637957 | 1999 | 29.209757637957 | 1998 | 28.420304728823 | 1997 | 28.420304728823 | 1996 | 28.420304728823 | 1995 | 28.420304728823 | 1994 | 27.630851819689 | 1993 | 27.630851819689 | 1992 | 27.630851819689 | 1991 | 26.924291466014 | 1990 | 26.08905028815 | 1989 | 24.792768611352 | 1988 | 24.709876055893 | 1987 | 24.482513618063 | 1986 | 24.694086997711 | 1985 | 24.299360543144 | 1984 | 24.299360543144 | 1983 | 24.480934712244 | 1982 | 23.967790321307 | 1981 | 23.904634088577 | 1980 | 24.251993368596 | 1979 | 23.650430251835 | 1978 | 23.50990763401 | 1977 | 23.50990763401 | 1976 | 23.50990763401 | 1975 | 23.50990763401 | 1974 | 23.50990763401 | 1973 | 24.326201942054 | 1972 | 24.61277334807 | 1971 | 24.654614352254 | 1970 | 24.63093076498 | 1969 | 25.401436804295 | 1968 | 25.402226257204 | 1967 | 24.86776663772 | 1966 | 24.86776663772 | 1965 | 24.86776663772 | 1964 | 24.86776663772 | 1963 | 24.86776663772 | 1962 | 24.86776663772 | 1961 | 24.86776663772 |
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