| Year | Value | | 2022 | 98.99997764 | | 2021 | 99.0000036 | | 2020 | 94.60755647 | | 2019 | 98.00000439 | | 2018 | 96.49165799 | | 2017 | 96.3576013 | | 2016 | 97.29820367 | | 2015 | 96.81032569 | | 2014 | 96.3 | | 2013 | 95.0534 | | 2012 | 94.64997805 | | 2011 | 93.48998265 | | 2010 | 93.39 | | 2009 | 92.08 | | 2008 | 90.57 | | 2007 | 86.93 | | 2006 | 82.55 | | 2005 | 81.99 | | 2004 | 77.69 | | 2003 | 78.13 | | 2002 | 72.84 | | 2001 | 64 | | 2000 | 52 | | 1999 | 40 | | 1998 | 22.56011255 | | 1997 | 20.41788144 | | 1996 | 18.25031077 | | 1995 | 6.423220493 | | 1994 | 4.152450292 | | 1993 | 2.783990846 | | 1992 | 2.216365832 | | 1991 | 1.407395158 | | 1990 | 0.707299448 |
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