| Year | Value | | 2021 | 4.3579912617571 | | 2020 | -7.840619620624 | | 2019 | 4.1133663985753 | | 2018 | 1.9998554579918 | | 2017 | 5.3095154514599 | | 2016 | 4.118126700767 | | 2015 | 3.320142360463 | | 2014 | 1.6219335762813 | | 2013 | 3.645735602009 | | 2012 | 4.6000526241387 | | 2011 | 4.0016163739536 | | 2010 | 2.7450716472289 | | 2009 | -6.8442981788258 | | 2008 | 5.7576748061175 | | 2007 | 8.4193096016432 | | 2006 | 8.1417751486083 | | 2005 | 10.29768047307 | | 2004 | 6.1920106895122 | | 2003 | 7.5293616480351 | | 2002 | 3.3153291337434 | | 2001 | 6.13590290599 |
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