| Year | Value | | 2021 | 10.919237722038 | | 2020 | -10.585512110816 | | 2019 | 3.8258041078151 | | 2018 | 4.0837044316339 | | 2017 | 6.2544100286502 | | 2016 | 2.6566031057595 | | 2015 | 6.0539219762272 | | 2014 | 0.42539746955468 | | 2013 | 1.106040549771 | | 2012 | -3.4870256773116 | | 2011 | -1.7153552877082 | | 2010 | 0.42538059812469 | | 2009 | -9.5206747986958 | | 2008 | 2.3134268633831 | | 2007 | 5.6564150868944 | | 2006 | 5.0634277666831 | | 2005 | 8.5235233281496 | | 2004 | 7.8647179412126 | | 2003 | 2.0637196545148 | | 2002 | 9.4893227557089 | | 2001 | 3.2263212320182 | | 2000 | 1.1366273520794 | | 1999 | -3.846376315756 | | 1998 | 3.6599323364225 | | 1997 | 7.4032687953037 | | 1996 | 7.5736435325076 |
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