Year | Value | 2022 | 5.571 | 2021 | 6.178 | 2020 | 6.956 | 2019 | 4.514 | 2018 | 5.412 | 2017 | 5.807 | 2016 | 6.882 | 2015 | 6.412 | 2014 | 7.352 | 2013 | 8.631 | 2012 | 10.021 | 2011 | 12.328 | 2010 | 16.707 | 2009 | 13.548 | 2008 | 5.455 | 2007 | 4.592 | 2006 | 5.915 | 2005 | 8.033 | 2004 | 10.248 | 2003 | 11.288 | 2002 | 10.026 | 2001 | 13.135 | 2000 | 13.93 | 1999 | 11.573 | 1998 | 9.51 | 1997 | 10.369 | 1996 | 9.915 | 1995 | 9.659 | 1994 | 7.561 | 1993 | 6.544 | 1992 | 3.681 | 1991 | 1.468 | 1990 | 0.637 | 1989 | 0.56 |
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