| Year | Value | | 2021 | 81.59307191 | | 2020 | 75.46919577 | | 2019 | 74.75631315 | | 2018 | 70.1 | | 2017 | 58.76981124 | | 2016 | 56.51470815 | | 2015 | 54.25961786 | | 2014 | 51.25470199 | | 2013 | 50.4 | | 2012 | 47.076 | | 2011 | 43.16400446 | | 2010 | 41 | | 2008 | 40.44 | | 2007 | 38.38 | | 2006 | 34.95197117 | | 2005 | 25.41326815 | | 2004 | 24.27213922 | | 2003 | 14.59250432 | | 2002 | 14.30417083 | | 2001 | 11.01510293 | | 2000 | 7.395629183 | | 1999 | 6.229054803 | | 1998 | 2.526177514 | | 1997 | 1.28295593 | | 1996 | 0.651474286 |
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