Year | Value | 2021 | 12.7 | 2020 | 12.75 | 2016 | 11.48 | 2015 | 11.27 | 2014 | 11.76 | 2013 | 11.35 | 2011 | 11.16 | 2010 | 11.06 | 2009 | 9.94 | 2008 | 10.82 | 2006 | 10.59 | 2005 | 10.55 | 2003 | 24.61 | 2002 | 25.17 | 2001 | 24.23 | 2000 | 24.69 | 1999 | 24.64 | 1998 | 23 | 1997 | 23 | 1996 | 22.95 | 1995 | 87.19 | 1992 | 28.13 | 1990 | 28.02 | 1989 | 27.83 | 1988 | 25.93 |
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