| Year | Value | | 2021 | -5.9698370704246 | | 2020 | 1.2576160755873 | | 2019 | 6.6185771394507 | | 2018 | 0.49717118132553 | | 2017 | 3.4879745140738 | | 2016 | -2.0731716434533 | | 2015 | 3.7397952552537 | | 2014 | 5.1772147811767 | | 2013 | 11.171516148194 | | 2012 | 7.6647581362269 | | 2011 | 14.284393532593 | | 2010 | 11.804323517221 | | 2009 | 3.0811948587413 | | 2008 | 4.042975585562 | | 2007 | 29.484419339551 | | 2006 | 19.078852033276 | | 2005 | 7.2700171520148 | | 2004 | 7.5761835173786 | | 2003 | 14.737178654291 | | 2002 | 5.8337573624857 | | 2001 | 22.64592698043 | | 2000 | -7.9909368086323 | | 1997 | 1.248153690887 | | 1996 | -5.4022499611349 | | 1995 | -15.965896081215 | | 1994 | -20.102614135253 |
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