| Year | Value | | 2021 | 51.63135772 | | 2020 | 45.84615896 | | 2019 | 34.80551799 | | 2018 | 28.6 | | 2017 | 24.3 | | 2016 | 20.7 | | 2015 | 17.58161801 | | 2014 | 15.44 | | 2013 | 13.3 | | 2012 | 11.1493 | | 2011 | 9 | | 2010 | 7.93 | | 2009 | 1.97 | | 2008 | 1.73 | | 2007 | 1.41 | | 2006 | 1.141389164 | | 2005 | 0.826551266 | | 2004 | 0.449843651 | | 2003 | 0.382810917 | | 2002 | 0.31295606 | | 2001 | 0.240015303 | | 2000 | 0.204651684 | | 1999 | 0.146668869 | | 1998 | 0.064393596 | | 1997 | 0.021998858 | | 1996 | 0.004510473 | | 1995 | 0.000924878 |
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