| Year | Value | | 2021 | 85.76058262 | | 2020 | 77.58622488 | | 2019 | 77.46966424 | | 2018 | 70.9 | | 2017 | 65 | | 2016 | 59.5 | | 2015 | 54.46195515 | | 2014 | 49.28 | | 2013 | 44.1 | | 2012 | 38.9301 | | 2011 | 34 | | 2010 | 26.53 | | 2009 | 24.8 | | 2008 | 23.2 | | 2007 | 16.3 | | 2006 | 11.03635278 | | 2005 | 6.869605067 | | 2004 | 6.588254875 | | 2003 | 5.97659285 | | 2002 | 5.347765169 | | 2001 | 3.617290649 | | 2000 | 2.203872939 | | 1999 | 1.119908615 | | 1998 | 0.569627464 | | 1997 | 0.309444238 | | 1996 | 0.22693009 |
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