| Year | Value | | 2022 | 95.61357052 | | 2021 | 93.08715788 | | 2020 | 92.41313602 | | 2019 | 91.74340039 | | 2018 | 90.50739533 | | 2017 | 89.41594465 | | 2016 | 87.47941467 | | 2015 | 84.94835296 | | 2014 | 79.86627043 | | 2013 | 74.2 | | 2012 | 72.9 | | 2011 | 72.2 | | 2010 | 72 | | 2009 | 69.4 | | 2008 | 66.7 | | 2007 | 64.8 | | 2006 | 60.8 | | 2005 | 56.9 | | 2004 | 56.39988039 | | 2003 | 52.20004335 | | 2002 | 43.08238303 | | 2001 | 38.67140323 | | 2000 | 27.82776068 | | 1999 | 21.23068197 | | 1998 | 14.54597958 | | 1997 | 10.51875705 | | 1996 | 4.748838672 | | 1995 | 3.218635643 | | 1994 | 2.784198266 | | 1993 | 1.334568031 | | 1992 | 0.849527883 | | 1991 | 0.120955444 |
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