Year | Value | 2021 | 39.906808510638 | 2020 | 39.95170212766 | 2019 | 40.000212765957 | 2018 | 40.072340425532 | 2017 | 40.042553191489 | 2016 | 40.042553191489 | 2015 | 40.021276595745 | 2014 | 40 | 2013 | 40.021276595745 | 2012 | 39.914893617021 | 2011 | 42.063829787234 | 2010 | 42.063829787234 | 2009 | 44.191489361702 | 2008 | 44.170212765957 | 2007 | 44.191489361702 | 2006 | 46.340425531915 | 2005 | 46.382978723404 | 2004 | 48.531914893617 | 2003 | 48.63829787234 | 2002 | 48.617021276596 | 2001 | 48.404255319149 | 2000 | 48.936170212766 | 1999 | 48.936170212766 | 1998 | 48.936170212766 | 1997 | 48.936170212766 | 1996 | 48.936170212766 | 1995 | 48.936170212766 | 1994 | 48.936170212766 | 1993 | 48.936170212766 | 1992 | 48.936170212766 | 1991 | 48.936170212766 | 1990 | 48.936170212766 | 1989 | 48.936170212766 | 1988 | 48.936170212766 | 1987 | 48.936170212766 | 1986 | 48.936170212766 | 1985 | 48.936170212766 | 1984 | 48.936170212766 | 1983 | 48.936170212766 | 1982 | 48.936170212766 | 1981 | 48.936170212766 | 1980 | 48.936170212766 | 1979 | 48.936170212766 | 1978 | 48.936170212766 | 1977 | 48.936170212766 | 1976 | 48.936170212766 | 1975 | 51.063829787234 | 1974 | 51.063829787234 | 1973 | 51.063829787234 | 1972 | 53.191489361702 | 1971 | 53.191489361702 | 1970 | 55.31914893617 | 1969 | 55.31914893617 | 1968 | 55.31914893617 | 1967 | 55.31914893617 | 1966 | 55.31914893617 | 1965 | 55.31914893617 | 1964 | 55.31914893617 | 1963 | 55.31914893617 | 1962 | 55.31914893617 | 1961 | 55.31914893617 |
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