| Year | Value | | 2021 | 8.9664746697208 | | 2020 | -3.34960704195 | | 2019 | 4.2227303539559 | | 2018 | 4.9762285117816 | | 2017 | 3.694588841863 | | 2016 | 5.2251239021308 | | 2015 | 5.2174631292563 | | 2014 | 1.021911608344 | | 2013 | 2.4815799202038 | | 2012 | -3.2213555928913 | | 2011 | -2.2309629410386 | | 2010 | -2.0945012371175 | | 2009 | -3.1346079660161 | | 2008 | 7.0017160489051 | | 2007 | 5.2118047265415 | | 2006 | 7.8587597514909 | | 2005 | 1.4635900396445 | | 2004 | 10.955280486287 | | 2003 | 2.724849779991 | | 2002 | 5.3325565167689 | | 2001 | 2.4190241992487 |
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