| Year | Value | | 2014 | -43.759835388561 | | 2013 | -39.866485911503 | | 2012 | -25.245250201382 | | 2011 | -36.391909569459 | | 2010 | -29.808896063883 | | 2009 | -57.629002267461 | | 2008 | -59.142143757797 | | 2007 | -53.951702006376 | | 2006 | -29.154369476668 | | 2005 | -10.3527490887 | | 2004 | -21.754050129702 | | 2003 | -39.263405226435 | | 2002 | -56.473759153784 | | 2001 | -16.101423866948 | | 2000 | -17.195829276878 |
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