| Year | Value | | 2014 | -116.89042676014 | | 2013 | -107.34155528831 | | 2012 | -122.882719437 | | 2011 | -107.23476107278 | | 2010 | -126.9581584225 | | 2009 | -133.24237745072 | | 2008 | -106.77516033009 | | 2007 | -100.04402114419 | | 2006 | -108.15468164536 | | 2005 | -133.19090035654 | | 2004 | -125.82356786997 | | 2003 | -136.59655240782 | | 2002 | -129.66699538104 | | 2001 | -143.20392816125 | | 2000 | -120.22781539975 | | 1999 | -84.073355604298 | | 1998 | -64.752284080256 | | 1997 | -65.978508740746 | | 1996 | -40.47605723454 | | 1995 | -22.216077461956 | | 1994 | -22.460772312041 | | 1993 | -20.218334378211 | | 1992 | -13.535379127293 | | 1991 | -22.582120659681 | | 1990 | -23.861458078991 |
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