| Year | Value | | 2022 | 98.24203749 | | 2021 | 98.66086333 | | 2020 | 98.45962893 | | 2019 | 97.12063569 | | 2018 | 97.06129871 | | 2017 | 97.36296032 | | 2016 | 98.13669867 | | 2015 | 96.37671417 | | 2014 | 94.67 | | 2013 | 93.7765 | | 2012 | 91.94992374 | | 2011 | 90.02985856 | | 2010 | 90.62 | | 2009 | 87.31 | | 2008 | 82.23 | | 2007 | 78.92 | | 2006 | 72.51 | | 2005 | 70 | | 2004 | 65.88 | | 2003 | 54.55 | | 2002 | 39.84 | | 2001 | 36.16342251 | | 2000 | 22.88732797 | | 1999 | 17.3879578 | | 1998 | 11.74555372 | | 1997 | 7.142704085 | | 1996 | 5.551653306 | | 1995 | 1.590941911 | | 1994 | 0.496486119 | | 1993 | 0.302155121 | | 1992 | 0.153198791 |
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