| Year | Value | | 2021 | -6.3628707787764 | | 2020 | 4.6161941792334 | | 2019 | 2.621217675285 | | 2018 | 15.506386932054 | | 2017 | 19.570814937471 | | 2016 | 4.4251944327893 | | 2015 | 8.5879214438569 | | 2014 | 1.6753252207674 | | 2013 | 12.09745398423 | | 2012 | 13.295602738937 | | 2011 | 9.2747593236424 | | 2010 | 21.226296159842 | | 2009 | 8.7271865868519 | | 2008 | -7.6740222627533 | | 2007 | 4.6178304724714 | | 2006 | 12.023315200629 | | 2005 | 8.5134973105782 | | 2004 | 19.723681402059 | | 2003 | -4.1252894879298 | | 2002 | 4.1032835161199 | | 2001 | -16.763748187379 | | 2000 | 37.563850998439 | | 1999 | 10.561002373732 | | 1998 | -5.8814260579743 | | 1997 | 9.597766378948 | | 1996 | 3.4497782573696 | | 1995 | -23.356024265267 |
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