| Year | Value | | 2021 | 8.2508283224232 | | 2020 | 0.17490083396068 | | 2019 | -5.5460712804371 | | 2018 | 9.5153459203857 | | 2017 | 1.6345229938932 | | 2016 | 1.2916707845769 | | 2015 | 4.02480963751 | | 2014 | 3.1120953411918 | | 2013 | 9.9427885101259 | | 2012 | 3.8621810216617 | | 2011 | -5.733980017452 | | 2010 | -3.8004496998298 | | 2009 | 0.92588638544511 | | 2008 | -8.2313413592322 | | 2007 | 2.6684009605103 | | 2006 | -1.3420990411786 | | 2005 | 18.326660455274 | | 2004 | 5.1895547664792 | | 2003 | 5.3349978682999 | | 2002 | -6.0231247729763 | | 2001 | 9.1542966345139 | | 2000 | 11.929315453258 | | 1999 | 0.022379796343344 | | 1998 | -3.3176069278201 | | 1997 | 4.1451734045954 | | 1996 | 1.8892235162811 | | 1995 | 10.328961159204 | | 1994 | -3.5864021422005 | | 1993 | 0.058056146260711 | | 1992 | 3.2152971540752 | | 1991 | 4.022258264794 |
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