| Year | Value | | 2022 | 83.17066333 | | 2021 | 78.49426371 | | 2020 | 78.11584474 | | 2019 | 75.67120669 | | 2018 | 72.23837339 | | 2017 | 69.89297065 | | 2016 | 69.08791547 | | 2015 | 66.83495949 | | 2014 | 63.21 | | 2013 | 59.8663 | | 2012 | 55.06999344 | | 2011 | 51.64999517 | | 2010 | 44.4 | | 2009 | 42.4 | | 2008 | 38.2 | | 2007 | 35.88 | | 2006 | 32.25 | | 2005 | 24 | | 2004 | 21.42 | | 2003 | 17.8 | | 2002 | 14.67 | | 2001 | 10.93502581 | | 2000 | 9.138837308 | | 1999 | 6.877292144 | | 1998 | 3.221821786 | | 1997 | 1.849634688 | | 1996 | 1.395360779 | | 1995 | 0.749616477 | | 1994 | 0.378174312 | | 1993 | 0.191062242 | | 1992 | 0.048291602 | | 1991 | 0.048788803 |
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