| Year | Value | | 2022 | 88.37535691 | | 2021 | 87.15070683 | | 2020 | 85.51438646 | | 2019 | 79.94695203 | | 2018 | 77.7 | | 2017 | 74.29490687 | | 2016 | 70.96898082 | | 2015 | 68.04306411 | | 2014 | 64.7 | | 2013 | 59.9 | | 2012 | 55.8 | | 2011 | 51 | | 2010 | 45 | | 2009 | 34 | | 2008 | 28.11262348 | | 2007 | 25.94663294 | | 2006 | 20.9272021 | | 2005 | 17.72058337 | | 2004 | 16.03668411 | | 2003 | 11.91369655 | | 2002 | 10.88212438 | | 2001 | 9.780807285 | | 2000 | 7.038683086 | | 1999 | 3.284481956 | | 1998 | 0.83076668 | | 1997 | 0.280339882 | | 1996 | 0.141954704 | | 1995 | 0.086277081 | | 1994 | 0.043705951 | | 1993 | 0.029527065 | | 1992 | 0.002992874 |
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