| Year | Value | | 2024 | 2.231727729217 | | 2023 | 12.819974821653 | | 2022 | 12.352663837812 | | 2021 | 2.6124818577648 | | 2020 | 0.21818181818183 | | 2019 | 0.26737967914444 | | 2018 | 2.1097046413502 | | 2017 | 1.4179881966692 | | 2016 | -1.0423053341507 | | 2015 | 0.94904064369708 | | 2014 | 4.1917454858126 | | 2013 | 3.3548100422129 | | 2012 | 3.6141804788214 | | 2011 | 4.6746987951807 | | 2010 | 1.4421901735517 | | 2009 | 1.4381353830895 | | 2008 | 11.965574680733 | | 2007 | 3.2387503582688 | | 2006 | 4.4298114337025 | | 2005 | 3.9514623522091 | | 2004 | 4.9640757674722 | | 2003 | 0.92287409360582 | | 2002 | -1.3012361743656 |
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