| Year | Value | | 2021 | 10.874036462053 | | 2020 | 10.634186934017 | | 2019 | 10.927722529143 | | 2018 | 11.341147145046 | | 2017 | 11.340465091843 | | 2016 | 11.207475539846 | | 2015 | 11.433239959537 | | 2014 | 11.603516599638 | | 2013 | 11.922008064661 | | 2012 | 12.060314836259 | | 2011 | 12.173166900116 | | 2010 | 11.895048766877 | | 2009 | 11.546833376821 | | 2008 | 12.071234657529 | | 2007 | 11.800382842789 | | 2006 | 11.281856779821 | | 2005 | 10.741377956292 |
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