| Year | Value | | 2022 | 23.85600981583 | | 2021 | 50.764749252023 | | 2020 | 36.665408234099 | | 2019 | 49.581543360105 | | 2018 | 14.39601234863 | | 2017 | 20.263352985955 | | 2016 | 20.987554366482 | | 2015 | 68.39922388436 | | 2014 | 105.93898378651 | | 2013 | 183.68708153535 | | 2012 | 255.09562342035 | | 2011 | 332.91874087427 | | 2010 | 257.30070401647 | | 2009 | 218.76681948123 | | 2008 | 372.975166655 | | 2007 | 223.95394593714 | | 2006 | 159.22577072862 |
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