Year | Value | 2022 | 24.848616305332 | 2021 | 25.399904326481 | 2020 | 24.094389783349 | 2019 | 25.523750007178 | 2018 | 25.085799532165 | 2017 | 25.705660411413 | 2016 | 25.891523456735 | 2015 | 24.31730414756 | 2014 | 27.227475791814 | 2013 | 27.09236411147 | 2012 | 27.674389829858 | 2011 | 27.803790685603 | 2010 | 25.673066209355 | 2009 | 26.341441861603 | 2008 | 29.489182941164 | 2007 | 26.664406455992 | 2006 | 26.143112687437 | 2005 | 22.810424371921 | 2004 | 19.16221989967 | 2003 | 18.398818615477 | 2002 | 18.707871857126 | 2001 | 19.710635624844 | 2000 | 26.765137959605 | 1999 | 22.073358390055 | 1998 | 14.940176518757 | 1997 | 16.918236720571 | 1996 | 16.761081162761 | 1995 | 14.512289528689 | 1994 | 15.346600318742 | 1993 | 14.781898757943 | 1992 | 21.574447292263 | 1991 | 18.267164372571 | 1990 | 17.764151413609 | 1989 | 13.417197693488 | 1988 | 12.751254918314 | 1987 | 11.758063848924 | 1986 | 15.203465054068 | 1985 | 16.885321483607 | 1984 | 14.069705487468 | 1983 | 15.857927641209 | 1982 | 13.74520172889 | 1981 | 21.769243600734 | 1980 | 21.38454497505 | 1979 | 19.876390347204 | 1978 | 20.858796997043 | 1977 | 21.200396769422 | 1976 | 17.879427029196 |
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