| Year | Value | | 2021 | 73.5 | | 2020 | 72.74801998 | | 2019 | 64.82632542 | | 2018 | 58 | | 2017 | 41.41379464 | | 2016 | 39.36299738 | | 2015 | 37.31205037 | | 2014 | 36.74474744 | | 2013 | 30 | | 2012 | 16 | | 2011 | 9 | | 2010 | 6 | | 2009 | 6.15 | | 2008 | 6.25 | | 2007 | 5.28 | | 2006 | 4.289932975 | | 2005 | 3.262554036 | | 2004 | 3.304889253 | | 2003 | 3.345190174 | | 2002 | 3.385922351 | | 2001 | 3.430886787 | | 2000 | 2.902666622 | | 1999 | 1.122391474 | | 1998 | 0.602400929 | | 1997 | 0.30774685 | | 1996 | 0.15745423 | | 1995 | 0.064521041 |
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