Year | Value | 2022 | 3.867 | 2021 | 4.715 | 2020 | 5.589 | 2019 | 4.496 | 2018 | 4.846 | 2017 | 5.212 | 2016 | 5.559 | 2015 | 5.571 | 2014 | 5.16 | 2013 | 5.458 | 2012 | 5.436 | 2011 | 6.536 | 2010 | 7.369 | 2009 | 8.301 | 2008 | 6.205 | 2007 | 6.002 | 2006 | 7.055 | 2005 | 7.124 | 2004 | 7.763 | 2003 | 8.21 | 2002 | 7.875 | 2001 | 8.978 | 2000 | 10.581 | 1999 | 13.036 | 1998 | 13.261 | 1997 | 11.813 | 1996 | 9.665 | 1995 | 9.449 | 1994 | 8.131 | 1993 | 5.883 | 1992 | 5.181 |
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