| Year | Value | | 2024 | 11.349836225163 | | 2023 | 16.214025272067 | | 2022 | 17.364499991788 | | 2021 | 17.432282917708 | | 2020 | 5.2286997472744 | | 2019 | 17.687582311202 | | 2018 | 14.896032617976 | | 2017 | 14.155195649372 | | 2016 | 9.8617859986019 | | 2015 | 9.1151460801984 | | 2014 | 7.7994539155673 | | 2013 | 8.2174167862798 | | 2012 | 5.1310211579236 | | 2011 | 4.2749706338656 | | 2010 | 1.1667834932794 | | 2009 | 0.75975731957369 | | 2008 | -8.2902914024508 | | 2007 | -4.5969815882656 |
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