| Year | Value | | 2014 | -310.38469438924 | | 2013 | -327.60037771254 | | 2012 | -328.95679554441 | | 2011 | -377.33275461862 | | 2010 | -465.48729816786 | | 2009 | -441.15660667922 | | 2008 | -340.42580419795 | | 2007 | -330.69132271724 | | 2006 | -185.40770764494 | | 2005 | -102.97492371504 | | 2004 | -56.920437538593 | | 2003 | -63.246602327593 | | 2002 | -70.961913163192 | | 2001 | -71.199199833843 | | 2000 | -66.508679916637 | | 1999 | -72.767524076156 | | 1998 | -37.804474277994 | | 1997 | -24.662622890667 | | 1996 | -22.574573565962 | | 1995 | -6.0291795841161 | | 1994 | -1.0569646465111 | | 1993 | 1.3439417675325 | | 1992 | 2.8062086250055 | | 1991 | 15.590405406892 | | 1990 | 8.3272724673236 |
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