Year | Value | 2022 | 11.379 | 2021 | 11.445 | 2020 | 11.49 | 2019 | 11.487 | 2018 | 11.566 | 2017 | 11.653 | 2016 | 12.188 | 2015 | 12.812 | 2014 | 13.57 | 2013 | 12.244 | 2012 | 14.114 | 2011 | 14.075 | 2010 | 14.858 | 2009 | 16.396 | 2008 | 16.39 | 2007 | 15.392 | 2006 | 14.966 | 2005 | 17.269 | 2004 | 16.408 | 2003 | 16.42 | 2002 | 17.161 | 2001 | 18.009 | 2000 | 18.215 | 1999 | 18.75 | 1998 | 20.75 | 1997 | 21.569 | 1996 | 21.473 | 1995 | 23.025 | 1994 | 23.086 | 1993 | 25.605 | 1992 | 26.442 | 1991 | 24.824 | 1990 | 24.119 | 1989 | 23.594 | 1988 | 23.365 | 1987 | 23.604 | 1986 | 23.862 | 1985 | 23.904 | 1984 | 23.964 | 1983 | 23.962 | 1982 | 23.991 | 1981 | 23.874 | 1980 | 23.866 | 1979 | 24.091 | 1978 | 24.301 | 1977 | 24.711 | 1976 | 24.741 | 1975 | 24.703 | 1974 | 26.387 |
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