| Year | Value | | 2021 | 70.77 | | 2020 | 63.94999611 | | 2019 | 58.97757455 | | 2018 | 49.03846808 | | 2017 | 47.69105515 | | 2016 | 42.94552688 | | 2015 | 38.2 | | 2014 | 29.5 | | 2013 | 22.5 | | 2012 | 18.2 | | 2011 | 14.9 | | 2010 | 12.5 | | 2009 | 11.23 | | 2008 | 10.18 | | 2007 | 9.451190626 | | 2006 | 7.375984956 | | 2005 | 5.843942092 | | 2004 | 4.634475088 | | 2003 | 2.195359731 | | 2002 | 1.59164126 | | 2001 | 0.646114017 | | 2000 | 0.491705679 | | 1999 | 0.199523843 | | 1998 | 0.020238555 | | 1997 | 0.010268463 | | 1996 | 0.001738533 | | 1995 | 0.001768954 | | 1994 | 0.000360674 |
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