| Year | Value | | 2022 | 35.47812105 | | 2021 | 45.42553268 | | 2020 | 41.3736053 | | 2019 | 36.28895457 | | 2018 | 37.54653613 | | 2017 | 43.83992085 | | 2016 | 41.20781493 | | 2015 | 16.7 | | 2014 | 10 | | 2013 | 6.6 | | 2012 | 4.4 | | 2011 | 2.9 | | 2010 | 2.7 | | 2009 | 2 | | 2008 | 1.9 | | 2007 | 1.8 | | 2006 | 1.524900791 | | 2005 | 1.039238205 | | 2004 | 0.849282415 | | 2003 | 0.758669629 | | 2002 | 0.497929361 | | 2001 | 0.395747702 | | 2000 | 0.231461671 | | 1999 | 0.118685917 | | 1998 | 0.060974439 | | 1997 | 0.018828361 | | 1996 | 0.00840978 | | 1995 | 0.000200256 |
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