| Year | Value | | 2014 | -191.51133676788 | | 2013 | -191.9184939977 | | 2012 | -166.23257160628 | | 2011 | -164.21177060935 | | 2010 | -108.27112297791 | | 2009 | -106.76224106723 | | 2008 | -200.67089047619 | | 2007 | -195.05844032665 | | 2006 | -208.59459753694 | | 2005 | -221.25661900408 | | 2004 | -217.55183084957 | | 2003 | -234.03486264508 | | 2002 | -236.56387503685 | | 2001 | -230.24278612124 | | 2000 | -208.93325532952 | | 1999 | -77.541379112483 | | 1998 | -44.619925189409 | | 1997 | -65.322739489311 | | 1996 | -174.68887965911 | | 1995 | -139.82557215944 | | 1994 | -146.91361736402 | | 1993 | -447.0860157895 | | 1992 | -370.22330491505 | | 1991 | -387.62562911183 | | 1990 | -316.75586208534 |
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