| Year | Value | | 2022 | 35.480497731434 | | 2021 | 31.078637545702 | | 2020 | 40.429209165897 | | 2019 | 47.856052219808 | | 2018 | 50.034674388511 | | 2017 | 50.348056853623 | | 2016 | 48.370647678603 | | 2015 | 48.679476722493 | | 2014 | 52.502084101818 | | 2013 | 53.404288086051 | | 2012 | 53.48076815173 | | 2011 | 54.153548613021 | | 2010 | 52.166736541331 | | 2009 | 46.051955044398 | | 2008 | 45.966216119883 | | 2007 | 58.232168514506 | | 2006 | 48.412761739821 | | 2005 | 49.191787902656 | | 2004 | 49.02469158537 | | 2003 | 44.253153888285 | | 2002 | 41.417735138285 |
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