Year | Value | 2014 | 50.268492453942 | 2013 | 45.874170274458 | 2012 | 47.31202305049 | 2011 | 48.840184473511 | 2010 | 43.087705272196 | 2009 | 43.558719710954 | 2008 | 44.3542007741 | 2007 | 45.181581318523 | 2006 | 43.24540599174 | 2005 | 45.334697531256 | 2004 | 45.838684440811 | 2003 | 46.380353513196 | 2002 | 44.569812651544 | 2001 | 43.310776588342 | 2000 | 42.980405297073 | 1999 | 39.846754140367 | 1998 | 39.000103958091 | 1997 | 37.59233660558 | 1996 | 37.44205086875 | 1995 | 33.027018322782 | 1994 | 31.287385929722 | 1993 | 29.683702353582 | 1992 | 24.682068379903 | 1991 | 25.002361783011 | 1990 | 24.020200928831 | 1989 | 23.314281377153 | 1988 | 24.567679021777 | 1987 | 25.695747011059 | 1986 | 24.137990499449 | 1985 | 24.431398721113 | 1984 | 26.457271905589 | 1983 | 30.482433353254 | 1982 | 30.109714306268 | 1981 | 28.646841780369 | 1980 | 29.233351828606 | 1979 | 28.803018396839 | 1978 | 27.408005232608 | 1977 | 25.400109162844 | 1976 | 23.533948266867 | 1975 | 24.068027114859 | 1974 | 26.345643253681 | 1973 | 31.105307225201 | 1972 | 30.491444075519 | 1971 | 26.011751246414 |
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