| Year | Value | | 2021 | -4.8595467639922 | | 2020 | 2.2354631706515 | | 2019 | -6.0152641373432 | | 2018 | -3.7987124403875 | | 2017 | 0.93487480311656 | | 2016 | 2.0642559886721 | | 2015 | 2.4403950730154 | | 2014 | -3.6312054991573 | | 2013 | -2.3190268513539 | | 2012 | -2.5273034668789 | | 2011 | 2.7009270311115 | | 2010 | 4.936410268748 | | 2009 | 7.4385433914465 | | 2008 | 8.0544156001475 | | 2007 | 14.749829392866 | | 2006 | 10.283837059113 | | 2005 | 7.4726505664867 | | 2004 | 6.4645371777981 | | 2003 | -16.359027979568 | | 2002 | -4.2360259074536 |
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