Year | Value | 2021 | 10.511101216232 | 2017 | 12.667118090381 | 2016 | 12.022437222167 | 2015 | 11.987614254166 | 2014 | 11.673785760634 | 2013 | 11.614661393347 | 2012 | 11.876534425496 | 2011 | 11.76898408227 | 2010 | 11.110532057383 | 2009 | 10.543182619998 | 2008 | 10.445764412883 | 2007 | 10.495344560367 | 2006 | 11.241389307052 | 2005 | 12.336793312368 | 2004 | 11.932480433467 | 2002 | 13.711737137778 | 1991 | 12.413358271978 |
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