| Year | Value | | 2022 | 75.298528895439 | | 2021 | 70.288671419454 | | 2020 | 66.171295978469 | | 2019 | 60.223448789778 | | 2018 | 55.75395573123 | | 2017 | 50.056909798448 | | 2016 | 47.652824616736 | | 2015 | 44.118877014527 | | 2014 | 41.171347367428 | | 2013 | 38.257882381854 | | 2012 | 35.691686434025 | | 2011 | 32.337801096101 | | 2010 | 28.915905406719 | | 2009 | 23.72124868748 | | 2008 | 19.228845578233 | | 2007 | 14.365962520923 | | 2006 | 10.166941865561 | | 2005 | 8.3129461573152 | | 2004 | 6.8745014827705 | | 2003 | 5.7538468714182 | | 2002 | 4.4020739828996 | | 2001 | 2.7790631652743 | | 2000 | 1.892068275054 | | 1999 | 0.85290564761046 | | 1998 | 0.32428115297507 | | 1997 | 0.094710332976236 | | 1996 | 0.033807711869069 | | 1995 | 0.011920426061702 | | 1994 | 0.0036451895790446 | | 1993 | 0.00087497645023483 | | 1992 | 2.3370385179041E-5 | | 1991 | 1.7793790439266E-6 |
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