| Year | Value | | 2021 | 0.83268802182641 | | 2020 | -10.07687227188 | | 2019 | 7.7054939218111 | | 2018 | 15.37987753432 | | 2017 | 4.5870105331803 | | 2016 | 8.2404906304318 | | 2015 | 4.0177405125755 | | 2014 | 4.0735745850029 | | 2013 | 9.8630328943535 | | 2012 | -2.0074355669684 | | 2011 | 5.4815174665547 | | 2010 | 0.4201911083626 | | 2009 | -4.6795386102999 | | 2008 | 12.755990228265 | | 2007 | 3.0539648528364 | | 2006 | 11.462186128085 | | 2005 | 3.1828319767703 | | 2004 | 3.5706464253995 | | 2003 | 3.7959928511685 |
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