| Year | Value | | 2021 | 68.86318451 | | 2020 | 61.26152265 | | 2019 | 59.34196605 | | 2018 | 58 | | 2017 | 55.68140925 | | 2016 | 30.8 | | 2015 | 22.9 | | 2014 | 17 | | 2013 | 12.7 | | 2012 | 9.4 | | 2011 | 7 | | 2010 | 6.5 | | 2009 | 4 | | 2008 | 2.26 | | 2007 | 1.62 | | 2006 | 1.270041159 | | 2005 | 0.953611449 | | 2004 | 0.781317175 | | 2003 | 0.625940229 | | 2002 | 0.486971705 | | 2001 | 0.343526263 | | 2000 | 0.194500528 | | 1999 | 0.105761909 | | 1998 | 0.094696004 | | 1997 | 0.082941498 | | 1996 | 0.031166241 | | 1995 | 0.01603083 |
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