Year | Value | 2021 | 5.31 | 2020 | 5.32 | 2019 | 5.39 | 2018 | 7.56 | 2017 | 8.46 | 2016 | 7.88 | 2015 | 7.82 | 2014 | 7.74 | 2011 | 8.13 | 2010 | 8.09 | 2009 | 8.09 | 2008 | 8.7 | 2007 | 8.93 | 2006 | 8.89 | 2005 | 9.24 | 2004 | 9.81 | 2003 | 10.69 | 2002 | 12.15 | 2001 | 15.39 | 2000 | 16.4 | 1999 | 16.34 | 1998 | 17.08 | 1997 | 16.66 | 1996 | 22.02 | 1994 | 33.32 | 1993 | 37.1 | 1992 | 39.71 |
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