| Year | Value | | 2021 | 78.24573185 | | 2020 | 69.20598813 | | 2019 | 61.21060766 | | 2018 | 49.1 | | 2017 | 39.4 | | 2016 | 31.7 | | 2015 | 25.40700977 | | 2014 | 21.2 | | 2013 | 15.3 | | 2012 | 12.92249 | | 2011 | 11 | | 2010 | 7 | | 2009 | 6 | | 2008 | 5.031615316 | | 2007 | 4.749983235 | | 2006 | 4.469173873 | | 2005 | 3.352592112 | | 2004 | 3.07552941 | | 2003 | 2.799630449 | | 2002 | 2.244832676 | | 2001 | 1.689902831 | | 2000 | 0.566392533 | | 1999 | 0.285308333 | | 1998 | 0.230359015 | | 1997 | 0.174571863 |
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