| Year | Value | | 2021 | 21.57982734 | | 2020 | 13.93797176 | | 2019 | 9.27180601 | | 2018 | 8.5 | | 2017 | 7.79 | | 2016 | 7.14 | | 2015 | 6.55 | | 2014 | 6 | | 2013 | 5 | | 2012 | 3.725034916 | | 2011 | 3 | | 2010 | 2.4 | | 2009 | 1.13 | | 2008 | 0.92 | | 2007 | 0.75 | | 2006 | 0.632707564 | | 2005 | 0.469914489 | | 2004 | 0.400295285 | | 2003 | 0.373440303 | | 2002 | 0.200992598 | | 2001 | 0.157732465 | | 2000 | 0.077080169 | | 1999 | 0.061780293 | | 1998 | 0.045423484 | | 1997 | 0.018686353 | | 1996 | 0.000960519 |
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