| Year | Value | | 2020 | -7.4161321467643 | | 2019 | 1.8271320814954 | | 2018 | 3.8377795274193 | | 2017 | 3.6624517975243 | | 2016 | 1.3100262241163 | | 2015 | -6.1273679068707 | | 2014 | 1.1011107743957 | | 2013 | 2.5486416274162 | | 2012 | 6.0841589606677 | | 2011 | 11.042587697589 | | 2010 | 9.6418211125227 | | 2009 | -8.1157360823308 | | 2008 | 11.090191535812 | | 2007 | 7.3043454669539 | | 2006 | 11.69572697326 | | 2005 | 9.6929101772063 | | 2004 | 8.4686843692735 | | 2003 | 4.2803269594897 | | 2002 | 4.0004229649873 |
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