| Year | Value | | 2021 | 85.82 | | 2020 | 82.458446 | | 2019 | 83.20881332 | | 2018 | 82.48 | | 2017 | 81.76077839 | | 2016 | 79.54939789 | | 2015 | 76.11 | | 2014 | 75.16 | | 2013 | 71.8 | | 2012 | 71.2 | | 2011 | 66.5 | | 2010 | 65.1 | | 2009 | 64.7 | | 2008 | 61.4 | | 2007 | 58.2 | | 2006 | 55.3 | | 2005 | 52.5 | | 2004 | 49.8 | | 2003 | 39.68962712 | | 2002 | 27.83632242 | | 2001 | 11.93645034 | | 2000 | 3.973678355 | | 1999 | 2.376247035 | | 1998 | 1.970249237 | | 1997 | 0.783428912 | | 1996 | 0.389464214 | | 1995 | 0.007752238 |
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