| Year | Value | | 2022 | 76.25916611 | | 2021 | 77.01838621 | | 2020 | 73.95751114 | | 2019 | 68.51762842 | | 2018 | 64.99354302 | | 2017 | 61.07575622 | | 2016 | 53.40412748 | | 2015 | 49.71630466 | | 2014 | 43 | | 2013 | 36.9 | | 2012 | 29.34 | | 2011 | 24.76351588 | | 2010 | 19.8 | | 2009 | 18.9 | | 2008 | 14.27 | | 2007 | 11.21 | | 2006 | 7.962073884 | | 2005 | 7.907007861 | | 2004 | 3.452438431 | | 2003 | 2.111942082 | | 2002 | 1.794969598 | | 2001 | 1.098793836 | | 2000 | 0.747630712 | | 1999 | 0.38165732 | | 1998 | 0.194904951 | | 1997 | 0.099576719 | | 1996 | 0.020359612 |
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