Year | Value | 2014 | 49.235465732583 | 2013 | 48.31082622554 | 2012 | 48.637341122931 | 2011 | 47.610214353395 | 2010 | 46.628226587841 | 2009 | 47.491956285492 | 2008 | 44.604229051069 | 2007 | 47.887622706962 | 2006 | 44.450067964559 | 2005 | 44.793085799894 | 2004 | 45.435016454925 | 2003 | 45.808386080248 | 2002 | 45.145539293671 | 2001 | 44.978466216355 | 2000 | 46.595641438973 | 1999 | 47.192449520315 | 1998 | 49.392514464723 | 1997 | 47.908119979305 | 1996 | 43.227863302766 | 1995 | 46.673742564353 | 1994 | 44.504899968216 | 1993 | 41.862885460709 | 1992 | 38.298731418007 | 1991 | 36.723547451086 | 1990 | 31.443129633238 | 1989 | 31.991220282135 | 1988 | 30.830085992726 | 1987 | 29.26882775605 | 1986 | 27.580262675854 | 1985 | 23.48097161117 | 1984 | 20.846447727596 | 1983 | 20.787936011382 | 1982 | 19.969802879115 | 1981 | 21.091161738355 | 1980 | 24.077573468987 | 1979 | 26.125814182186 | 1978 | 26.570632798105 | 1977 | 27.05691537515 | 1976 | 27.182841496806 | 1975 | 30.959266440187 | 1974 | 31.208484901782 | 1973 | 32.740012719786 | 1972 | 30.901650284836 | 1971 | 28.37419399764 |
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