Year | Value | 2014 | 11.870133377942 | 2013 | 13.890819183636 | 2012 | 10.58524401182 | 2011 | 7.7126214711091 | 2010 | 7.2442601994906 | 2009 | 4.0987081239605 | 2008 | 8.2076699424393 | 2007 | 8.0840847221814 | 2006 | 7.4018272706851 | 2005 | 9.5791187494257 | 2004 | 13.130090892402 | 2003 | 10.38886476879 | 2002 | 14.509877928242 | 2001 | 20.479129114251 | 2000 | 21.23367085929 | 1999 | 24.259278465116 | 1998 | 26.893560765724 | 1997 | 29.167536268167 | 1996 | 30.099616182298 | 1995 | 30.441680305484 | 1994 | 28.951904042017 | 1993 | 28.59991185319 | 1992 | 27.456635583681 | 1991 | 26.688271588151 | 1990 | 25.721614921121 | 1989 | 25.942323285026 | 1988 | 26.520343971292 | 1987 | 24.995108801086 | 1986 | 24.670841545929 | 1985 | 20.837475246797 | 1984 | 22.376667612333 | 1983 | 29.638858617149 | 1982 | 36.008175039852 | 1981 | 39.083226803632 | 1980 | 43.482604298492 | 1979 | 45.825843843486 | 1978 | 45.622781771228 | 1977 | 43.478811541838 | 1976 | 43.34685649144 | 1975 | 40.813369000906 | 1974 | 38.586015293494 | 1973 | 37.496240503184 | 1972 | 32.64012998649 | 1971 | 29.607707198962 |
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