Year | Value | 2021 | 41.471897810219 | 2020 | 42.538503649635 | 2019 | 42.846715328467 | 2018 | 42.849671532847 | 2017 | 42.85697080292 | 2016 | 43.127737226277 | 2015 | 42.857664233577 | 2014 | 42.857299270073 | 2013 | 43.332116788321 | 2012 | 43.843065693431 | 2011 | 43.832116788321 | 2010 | 43.843065693431 | 2009 | 43.843065693431 | 2008 | 43.102189781022 | 2007 | 40.839416058394 | 2006 | 40.875912408759 | 2005 | 39.306569343066 | 2004 | 40.948905109489 | 2003 | 40.912408759124 | 2002 | 41.605839416058 | 2001 | 41.569343065693 | 2000 | 41.751824817518 | 1999 | 41.788321167883 | 1998 | 41.569343065693 | 1997 | 41.423357664234 | 1996 | 41.277372262774 | 1995 | 41.131386861314 | 1994 | 41.094890510949 | 1993 | 41.094890510949 | 1992 | 41.131386861314 | 1991 | 41.131386861314 | 1990 | 40.912408759124 | 1989 | 40.51094890511 | 1988 | 40.766423357664 | 1987 | 40.547445255474 | 1986 | 40.547445255474 | 1985 | 40.583941605839 | 1984 | 40.620437956204 | 1983 | 40.51094890511 | 1982 | 40.656934306569 | 1981 | 40.729927007299 | 1980 | 40.802919708029 | 1979 | 40.766423357664 | 1978 | 40.656934306569 | 1977 | 40.474452554745 | 1976 | 39.233576642336 | 1975 | 39.416058394161 | 1974 | 40.948905109489 | 1973 | 41.824817518248 | 1972 | 42.846715328467 | 1971 | 43.795620437956 | 1970 | 44.890510948905 | 1969 | 45.07299270073 | 1968 | 45.255474452555 | 1967 | 45.401459854015 | 1966 | 45.255474452555 | 1965 | 45.14598540146 | 1964 | 44.890510948905 | 1963 | 45 | 1962 | 44.963503649635 | 1961 | 44.963503649635 |
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