| Year | Value | | 2020 | -5.4968242210409 | | 2019 | 1.2449401802966 | | 2018 | 1.9451027255369 | | 2017 | 3.2735819980216 | | 2016 | 4.0512632029982 | | 2015 | -7.0468298659577 | | 2014 | 0.92784165919883 | | 2013 | 2.0172823729477 | | 2012 | 3.3395115183988 | | 2011 | 8.766805059397 | | 2010 | 9.4186942094832 | | 2009 | -4.9404873026481 | | 2008 | 6.913997410701 | | 2007 | 8.85301824406 | | 2006 | 9.6770829171085 | | 2005 | 9.3893436538494 | | 2004 | 6.9175842294934 | | 2003 | 4.2100591068221 | | 2002 | 6.2939378697279 | | 2001 | 5.5817584747337 |
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