Year | Value | 2021 | 49.400093491923 | 2020 | 48.979379836908 | 2019 | 48.797589985976 | 2018 | 48.605412143562 | 2017 | 48.42362229263 | 2016 | 48.241832441697 | 2015 | 48.449592271334 | 2014 | 46.600529787566 | 2013 | 46.579753804602 | 2012 | 46.564171817379 | 2011 | 46.564171817379 | 2010 | 48.189892484288 | 2009 | 48.189892484288 | 2008 | 48.174310497065 | 2007 | 44.164545785072 | 2006 | 44.09702384044 | 2005 | 45.582506622345 | 2004 | 45.120241001402 | 2003 | 44.834571235652 | 2002 | 45.447462733081 | 2001 | 45.701968524386 | 2000 | 46.886199553316 | 1999 | 47.327689191295 | 1998 | 43.577624266348 | 1997 | 44.813795252688 | 1996 | 46.262920064405 | 1995 | 45.785072456241 | 1994 | 46.304472030333 | 1993 | 45.800654443463 | 1992 | 45.603282605308 | 1991 | 45.234508907703 | 1990 | 46.06554822625 | 1989 | 45.847400405132 | 1988 | 45.862982392354 | 1987 | 45.873370383836 | 1986 | 45.883758375318 | 1985 | 45.8941463668 | 1984 | 45.899340362541 | 1983 | 45.904534358282 | 1982 | 45.909728354023 | 1981 | 45.914922349764 | 1980 | 45.920116345505 | 1979 | 45.925310341245 | 1978 | 45.930504336986 | 1977 | 45.935698332727 | 1976 | 46.979691476653 | 1975 | 46.984885472394 | 1974 | 46.984885472394 | 1973 | 46.725185685348 | 1972 | 46.465485898302 | 1971 | 46.465485898302 | 1970 | 46.039578247546 | 1969 | 46.242144081442 | 1968 | 47.35365917 | 1967 | 46.470679894042 | 1966 | 45.95128031995 | 1965 | 45.95128031995 | 1964 | 45.431880745858 | 1963 | 45.431880745858 | 1962 | 44.912481171765 | 1961 | 44.912481171765 |
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