| Year | Value | | 2021 | 93.89752157 | | 2020 | 93.20564892 | | 2019 | 90.71866533 | | 2017 | 91.56746703 | | 2016 | 89.7 | | 2015 | 87.9 | | 2014 | 86.1 | | 2013 | 84.4 | | 2012 | 82.7 | | 2011 | 81 | | 2010 | 81 | | 2009 | 78.53 | | 2008 | 70.04 | | 2007 | 70.87 | | 2006 | 48.936847 | | 2005 | 37.60576622 | | 2004 | 26.83795439 | | 2003 | 13.54641288 | | 2002 | 11.26046872 | | 2000 | 10.53883561 | | 1999 | 7.635686143 | | 1998 | 6.886209218 | | 1997 | 3.050175385 | | 1996 | 1.526601023 |
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