| Year | Value | | 2021 | 4.4262199293256 | | 2020 | -3.2336660862094 | | 2019 | 0.27869287136879 | | 2018 | 5.4896975709218 | | 2017 | 3.4062217936085 | | 2016 | -3.6584415789451 | | 2015 | -5.918351339973 | | 2014 | 0.70370054935157 | | 2013 | 0.63220073487673 | | 2012 | 4.0273041765574 | | 2011 | 9.1097750220491 | | 2010 | 13.327448931355 | | 2009 | -17.243881730118 | | 2008 | 4.3977397882122 | | 2007 | 14.023748930024 | | 2006 | 12.637646922509 | | 2005 | 10.679704729769 | | 2004 | 14.839447589297 | | 2003 | 7.0111875953411 | | 2002 | 3.4066195821588 | | 2001 | 2.9337258114739 | | 2000 | 22.842308483163 | | 1999 | 20.321560136689 | | 1998 | -5.6961102078192 | | 1997 | 4.005967501006 | | 1996 | 20.672848955358 | | 1995 | -10.46823410731 | | 1994 | -14.645256658075 | | 1993 | -21.730186997568 |
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