Year | Value | 2021 | 0.47308 | 2020 | 4.323665454 | 2019 | 22.73254 | 2018 | 25.22637 | 2017 | 27.81465 | 2016 | 25.294469 | 2015 | 26.71765 | 2014 | 30.81553 | 2013 | 19.929 | 2012 | 11.102 | 2011 | 16.721 | 2010 | 17.987 | 2009 | 22.379 | 2008 | 27.174 | 2007 | 32.61 | 2006 | 39.363 | 2005 | 38.757 | 2004 | 40.565 | 2003 | 36.231 | 2002 | 27.317 | 2001 | 25.98 | 2000 | 32.224 | 1999 | 26.2000007629 | 1998 | 24.7000007629 | 1997 | 23.1000003815 | 1996 | 22.2000007629 | 1995 | 25.6000003815 | 1994 | 21.7999992371 | 1993 | 24 | 1992 | 26.1000003815 | 1991 | 22.3999996185 | 1990 | 15 | 1989 | 17.2999992371 | 1988 | 17.2000007629 | 1987 | 16.2999992371 | 1986 | 17 | 1985 | 17.2000007629 | 1984 | 13.5 | 1983 | 13.6999998093 | 1982 | 13.6000003815 | 1981 | 11.8999996185 | 1980 | 12.1000003815 | 1979 | 15.1000003815 | 1978 | 15.1000003815 | 1977 | 14 | 1976 | 13.8999996185 | 1975 | 14.3000001907 | 1974 | 14.5 | 1973 | 14.6000003815 | 1972 | 15.3999996185 | 1971 | 12.3999996185 | 1970 | 11.6000003815 |
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