Year | Value | 2022 | 30.503111497477 | 2021 | 33.640408472428 | 2020 | 26.903484605397 | 2019 | 29.014530753883 | 2018 | 30.277067367751 | 2017 | 29.514916108469 | 2016 | 27.594808602167 | 2015 | 27.678131896778 | 2014 | 26.343275554048 | 2013 | 25.993696055745 | 2012 | 25.99211882711 | 2011 | 26.922581246671 | 2010 | 26.01663045336 | 2009 | 23.250693654114 | 2008 | 24.42111961122 | 2007 | 27.055162686208 | 2006 | 26.745376914933 | 2005 | 25.357024234892 | 2004 | 24.944971454141 | 2003 | 24.560955555082 | 2002 | 23.640181343113 | 2001 | 25.144862190224 | 2000 | 27.027384107437 | 1999 | 26.740319869623 | 1998 | 25.637114759953 | 1997 | 27.390786162789 | 1996 | 27.087400387214 | 1995 | 26.344786240276 | 1994 | 25.331363591661 | 1993 | 24.360776226471 | 1992 | 24.070684422853 | 1991 | 24.734972617411 | 1990 | 25.208531589684 | 1989 | 26.47532542354 | 1988 | 25.092964139354 | 1987 | 23.836156422484 | 1986 | 24.00452568488 | 1985 | 23.518464460602 | 1984 | 25.488948115646 | 1983 | 22.8292039602 | 1982 | 22.279641642385 | 1981 | 22.793843209792 | 1980 | 22.666544051731 | 1979 | 22.675361671732 | 1978 | 22.749883378672 | 1977 | 24.266926241613 | 1976 | 25.806027212321 | 1975 | 25.229706844173 | 1974 | 28.44035604331 | 1973 | 30.069601228805 | 1972 | 29.004961421781 | 1971 | 28.648097403418 | 1970 | 28.977244776166 | 1969 | 31.496596802766 |
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