Year | Value | 2021 | 16.295081967213 | 2020 | 16.295081967213 | 2019 | 16.295081967213 | 2018 | 16.295081967213 | 2017 | 16.295081967213 | 2016 | 16.295081967213 | 2015 | 16.295081967213 | 2014 | 16.295081967213 | 2013 | 16.295081967213 | 2012 | 16.295081967213 | 2011 | 16.295081967213 | 2010 | 16.295081967213 | 2009 | 16.295081967213 | 2008 | 16.295081967213 | 2007 | 16.27868852459 | 2006 | 16.55737704918 | 2005 | 17.868852459016 | 2004 | 18.196721311475 | 2003 | 20.327868852459 | 2002 | 21.475409836066 | 2001 | 22.786885245902 | 2000 | 23.27868852459 | 1999 | 25.245901639344 | 1998 | 25.409836065574 | 1997 | 27.868852459016 | 1996 | 28.524590163934 | 1995 | 29.508196721311 | 1994 | 31.967213114754 | 1993 | 32.295081967213 | 1992 | 32.295081967213 | 1991 | 32.459016393443 | 1990 | 34.262295081967 | 1989 | 34.426229508197 | 1988 | 34.426229508197 | 1987 | 34.426229508197 | 1986 | 34.754098360656 | 1985 | 35.737704918033 | 1984 | 35.245901639344 | 1983 | 34.754098360656 | 1982 | 34.426229508197 | 1981 | 34.098360655738 | 1980 | 33.606557377049 | 1979 | 33.114754098361 | 1978 | 32.786885245902 | 1977 | 32.786885245902 | 1976 | 32.786885245902 | 1975 | 32.786885245902 | 1974 | 32.622950819672 | 1973 | 32.786885245902 | 1972 | 32.786885245902 | 1971 | 32.786885245902 | 1970 | 31.147540983607 | 1969 | 31.147540983607 | 1968 | 31.147540983607 | 1967 | 31.147540983607 | 1966 | 29.508196721311 | 1965 | 29.508196721311 | 1964 | 29.508196721311 | 1963 | 29.508196721311 | 1962 | 27.868852459016 | 1961 | 27.868852459016 |
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