| Year | Value | | 2022 | 87.97728101 | | 2021 | 85.26956666 | | 2020 | 77.84374066 | | 2019 | 66.65241946 | | 2018 | 56.81748093 | | 2017 | 52.89192934 | | 2016 | 47.50496562 | | 2015 | 39.31612674 | | 2014 | 34.89 | | 2013 | 28.94 | | 2012 | 26.46 | | 2011 | 23.66992562 | | 2010 | 22.4 | | 2009 | 20.1 | | 2008 | 18.2 | | 2007 | 20.03 | | 2006 | 17.16071472 | | 2005 | 15.02600436 | | 2004 | 10.67730332 | | 2003 | 9.299027238 | | 2002 | 7.531250335 | | 2001 | 5.556326121 | | 2000 | 3.689041279 | | 1999 | 2.426242432 | | 1998 | 1.091218985 | | 1997 | 0.360522185 | | 1996 | 0.115472136 | | 1995 | 0.074825338 | | 1994 | 0.038614321 | | 1993 | 0.013580966 | | 1992 | 0.000343725 | | 1991 | 5.22E-5 |
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