| Year | Value | | 2021 | -16.202624106291 | | 2020 | -25.594252985753 | | 2019 | -7.1833727866189 | | 2018 | -4.7090840125927 | | 2017 | 1.9754891962008 | | 2016 | 5.7174235438075 | | 2015 | 8.0215873141836 | | 2014 | 3.4356557489818 | | 2013 | 4.8308201501186 | | 2012 | 5.5567640598208 | | 2011 | -6.5016862175364 | | 2010 | 3.4976108876937 | | 2009 | 17.333802074939 | | 2008 | 5.3473971091844 | | 2007 | 10.695217944993 | | 2006 | 0.27862591724791 | | 2005 | 2.1583453376027 | | 2004 | 23.643338180143 | | 2003 | -13.600573342914 | | 2002 | 3.7016005142558 | | 2001 | 0.0084504115998527 | | 2000 | 1.9852212926194 | | 1999 | 3.3512851803785 | | 1998 | 9.2833410844638 | | 1997 | -2.1454620559855 | | 1996 | 10.782445484892 | | 1995 | 8.6874287316809 | | 1994 | 13.88314807998 | | 1993 | 15.841537619554 | | 1992 | 36.261593418932 | | 1991 | 34.036144023642 |
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