| Year | Value | | 2021 | 31.63313086 | | 2020 | 23.44750876 | | 2019 | 18.27725712 | | 2018 | 17.1 | | 2017 | 15.99999943 | | 2016 | 13.50423285 | | 2015 | 10 | | 2014 | 7 | | 2013 | 4.4 | | 2012 | 3.95 | | 2011 | 3.2 | | 2010 | 2.9 | | 2009 | 2.4 | | 2008 | 1.9 | | 2007 | 1.6 | | 2006 | 1.3 | | 2005 | 1.1 | | 2004 | 0.877574971 | | 2003 | 0.676962857 | | 2002 | 0.222484414 | | 2001 | 0.171300351 | | 2000 | 0.11719444 | | 1999 | 0.075130889 | | 1998 | 0.009244125 | | 1997 | 0.007900283 | | 1996 | 0.001622155 |
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