| Year | Value | | 2021 | 79.21829353 | | 2020 | 75.03790912 | | 2019 | 70.1248443 | | 2018 | 62.55315539 | | 2017 | 58.88947945 | | 2016 | 53.0009696 | | 2015 | 48.88464368 | | 2014 | 46.23597546 | | 2013 | 40.954129 | | 2012 | 35.27 | | 2011 | 28.70826284 | | 2010 | 23.3 | | 2009 | 17.9 | | 2008 | 11 | | 2007 | 6.55 | | 2006 | 4.506124564 | | 2005 | 3.749764415 | | 2004 | 3.489477881 | | 2003 | 3.148127588 | | 2002 | 1.873885116 | | 2001 | 1.238759547 | | 2000 | 0.716183762 | | 1999 | 0.405385448 | | 1998 | 0.301075792 | | 1997 | 0.198821885 | | 1996 | 0.098580381 | | 1995 | 0.043083985 | | 1994 | 0.013641246 | | 1993 | 0.00077697 |
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