Year | Value | 2022 | 6.9677600176595 | 2021 | 9.3054468233744 | 2020 | 10.521874551266 | 2019 | 8.1474178347819 | 2018 | 8.0836935694935 | 2017 | 8.0606271724419 | 2016 | 7.7014254601672 | 2015 | 6.5870070018644 | 2014 | 6.031151508072 | 2013 | 6.2050036636157 | 2012 | 6.4296414976738 | 2011 | 6.6165389544219 | 2009 | 7.8620096682877 | 2008 | 6.8349730593428 | 2007 | 7.4576791572009 | 2006 | 7.3345799375791 | 2005 | 8.4422651089016 | 2004 | 8.5812568011345 | 2003 | 9.5361618926374 | 2002 | 9.9906213549581 | 2001 | 9.1613487670444 | 1999 | 9.8058128956695 | 1998 | 9.0177652815375 | 1997 | 8.5669487652071 | 1996 | 8.88345123883 | 1995 | 8.396009360641 | 1993 | 6.0027529110313 | 1992 | 6.5347982486236 |
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