| Year | Value | | 2019 | 61.83630006 | | 2018 | 62.67892362 | | 2017 | 57.14840432 | | 2016 | 42.97867519 | | 2015 | 37.30509742 | | 2014 | 29.07018437 | | 2013 | 27.93 | | 2012 | 21.2 | | 2011 | 16.0172908 | | 2010 | 15.9 | | 2009 | 14.33 | | 2008 | 12.94 | | 2007 | 11.69 | | 2006 | 11.15960131 | | 2005 | 9.738062208 | | 2004 | 8.407984759 | | 2003 | 5.241269054 | | 2002 | 3.770585038 | | 2001 | 1.079751722 | | 2000 | 0.541182549 | | 1999 | 0.314690541 | | 1998 | 0.226699199 | | 1997 | 0.068220214 | | 1996 | 0.031949001 | | 1995 | 9.17E-5 |
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