Year | Value | 2021 | 33.63315905 | 2020 | 27.95308059 | 2019 | 23.48259047 | 2018 | 18.9 | 2017 | 16.3 | 2016 | 15.7 | 2015 | 10 | 2014 | 5.41 | 2013 | 3.2 | 2012 | 2.6 | 2011 | 2.5 | 2010 | 2.3 | 2009 | 2 | 2008 | 0.53 | 2007 | 0.551376581 | 2004 | 0.031011185 | 2003 | 0.031868935 | 2002 | 0.032713307 | 2001 | 0.033812227 | 2000 | 0.017702706 | 1999 | 0.011328732 | 1998 | 0.004099387 | 1997 | 0.004489443 |
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