Year | Value | 2023 | 9.388 | 2022 | 10.465 | 2021 | 11.969 | 2020 | 13.148 | 2019 | 13.73 | 2018 | 10.956 | 2017 | 10.919 | 2016 | 10.899 | 2015 | 10.304 | 2014 | 9.901 | 2013 | 9.713 | 2012 | 9.21 | 2011 | 9.789 | 2010 | 11.879 | 2009 | 14.026 | 2008 | 10.965 | 2007 | 10.285 | 2006 | 10.227 | 2005 | 10.636 | 2004 | 10.838 | 2003 | 10.542 | 2002 | 10.358 | 2001 | 8.381 | 2000 | 6.495 | 1999 | 7.687 | 1998 | 6.888 | 1997 | 6.841 | 1996 | 6.629 | 1995 | 7.644 | 1994 | 8.577 | 1993 | 8.962 | 1992 | 8.509 | 1991 | 8.21 | 1990 | 8.015 | 1989 | 8.26 | 1988 | 8.04 | 1985 | 11.21 | 1984 | 11.92 | 1983 | 12.06 | 1982 | 10.93 |
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