| Year | Value | | 2021 | 78.98965145 | | 2020 | 72.80748713 | | 2019 | 66.6999983 | | 2018 | 64.19081023 | | 2017 | 55.50015506 | | 2016 | 49.59999484 | | 2015 | 46.49999434 | | 2014 | 46.16 | | 2013 | 43.8 | | 2012 | 41.4416 | | 2011 | 39.1 | | 2010 | 36.8 | | 2009 | 34.07 | | 2008 | 27.53 | | 2007 | 17.1 | | 2006 | 12.98640865 | | 2005 | 9.655086542 | | 2004 | 8.528817752 | | 2003 | 6.490845795 | | 2002 | 5.252887295 | | 2001 | 4.297966035 | | 2000 | 2.750740293 | | 1999 | 1.602494764 | | 1998 | 0.107940957 | | 1997 | 0.043656974 | | 1996 | 0.027615372 | | 1995 | 0.011191954 | | 1994 | 0.007379544 |
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