Year | Value | 2021 | 6.02 | 2020 | 6.29 | 2019 | 6.71 | 2018 | 6.25 | 2017 | 5.86 | 2016 | 6.31 | 2013 | 5.37 | 2012 | 5.43 | 2011 | 5.3 | 2010 | 5.18 | 2009 | 4.96 | 2008 | 6.84 | 2007 | 5.57 | 2006 | 5.82 | 2005 | 5.78 | 2004 | 5.81 | 2003 | 5.74 | 2002 | 6.28 | 2001 | 6.13 | 2000 | 8.02 | 1999 | 9.86 | 1998 | 7.93 | 1997 | 20.57 | 1996 | 10.76 | 1995 | 14.01 | 1993 | 16.74 | 1990 | 23.15 | 1989 | 24.78 |
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