| Year | Value | | 2021 | 1.0987531022324 | | 2020 | -2.1446200424943 | | 2019 | -1.2559556604023 | | 2018 | -5.8000438232644 | | 2017 | 4.0985345506764 | | 2016 | 4.9498368068217 | | 2015 | 9.3298938628346 | | 2014 | 8.9273815596401 | | 2013 | 2.8144274696129 | | 2012 | 4.6389857038184 | | 2011 | 5.0915640361048 | | 2010 | 2.796162773546 | | 2009 | 0.35448860218101 | | 2008 | 4.8415471781297 | | 2007 | 5.9298381063056 | | 2006 | 0.59207672336355 | | 2005 | 5.2166153768081 | | 2004 | 4.0203944838473 | | 2003 | 1.1394460299344 | | 2002 | 1.0813027507016 | | 2001 | 0.93629597598377 | | 2000 | 2.8677484386393 | | 1999 | 3.9183291109953 | | 1998 | 8.0453824269327 | | 1997 | 5.6030063307242 | | 1996 | 6.3309462996469 | | 1995 | 11.083227241102 |
|