| Year | Value | | 2021 | 47.53319655112 | | 2020 | -21.603207664208 | | 2019 | 22.864884969214 | | 2018 | 30.889864700409 | | 2017 | 21.39593026499 | | 2016 | 1.8360650186716 | | 2015 | 5.745893406076 | | 2014 | 13.236262834296 | | 2013 | 30.262445143273 | | 2012 | 45.593704477227 | | 2011 | 21.061780009897 | | 2010 | 51.803832963863 | | 2009 | 43.231596450432 | | 2008 | 66.268280718278 | | 2007 | 64.144350875635 | | 2006 | 67.902005460143 | | 2005 | 61.85593751477 | | 2004 | 43.884911865115 | | 2003 | 49.311651100535 | | 2002 | 27.780947255113 |
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