Year | Value | 2022 | 30.707236452452 | 2021 | 28.1374154945 | 2020 | 25.818935741198 | 2019 | 37.208836602454 | 2018 | 34.464643780698 | 2017 | 53.296820355856 | 2016 | 41.232430308184 | 2015 | 35.215639961686 | 2014 | 28.469533254541 | 2013 | 26.33691989864 | 2012 | 23.573034255525 | 2011 | 14.298059753577 | 2010 | 16.560971575393 | 2009 | 11.180450578577 | 2008 | 6.4782869945909 | 2007 | 18.747865246985 | 2006 | 23.943052821901 | 2005 | 30.975606561986 | 2004 | 28.703211211838 | 2003 | 19.552854497335 | 2002 | 20.545613529464 | 2001 | 19.483618063366 | 2000 | 20.290090814966 | 1999 | 24.71654235794 | 1998 | 18.72415018731 | 1997 | 21.689128569972 | 1996 | 30.053240055544 | 1995 | 22.277548003099 | 1994 | 26.293344990095 | 1993 | 21.343293949181 | 1992 | 20.989437671313 | 1991 | 21.746481403885 | 1990 | 23.584458034543 | 1989 | 29.734977961105 | 1988 | 35.437428381333 | 1987 | 35.310551663984 | 1986 | 32.565194936001 | 1985 | 33.437434182806 | 1984 | 30.846904117749 | 1983 | 18.401918964462 | 1982 | 12.604652944102 | 1981 | 23.637392260397 | 1980 | 33.124146556728 | 1979 | 26.159675412006 | 1978 | 46.149966882978 | 1977 | 43.653689593229 | 1976 | 29.211285236804 |
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