Year | Value | 2021 | 5 | 2020 | 5.29 | 2018 | 5.23 | 2017 | 5.36 | 2016 | 11.12 | 2015 | 6.05 | 2014 | 5.98 | 2013 | 10.33 | 2012 | 10.18 | 2011 | 10.36 | 2010 | 10.12 | 2009 | 9.97 | 2008 | 9.76 | 2007 | 8.36 | 2006 | 9.2 | 2005 | 9.12 | 2004 | 9.12 | 2003 | 9.49 | 2002 | 9.58 | 2001 | 9.91 | 2000 | 9.84 | 1999 | 8.54 | 1998 | 10.25 | 1997 | 9.72 | 1996 | 9.83 | 1995 | 8.27 | 1992 | 11.18 | 1990 | 12.98 | 1989 | 14.89 | 1988 | 18.83 |
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