| Year | Value | | 2014 | 3,821.1451704374 | | 2013 | 3,663.6711973436 | | 2012 | 3,607.7037981132 | | 2011 | 3,529.9187778536 | | 2010 | 3,470.7850302297 | | 2009 | 3,622.2903169101 | | 2008 | 3,733.626495397 | | 2007 | 3,564.2067852693 | | 2006 | 3,353.3043274293 | | 2005 | 3,187.0310799488 | | 2004 | 3,196.8493444771 | | 2003 | 3,087.655147717 | | 2002 | 2,848.9134832404 | | 2001 | 2,695.9062676291 | | 2000 | 2,516.9050982759 | | 1999 | 2,702.4281561007 | | 1998 | 2,825.8846526289 | | 1997 | 2,727.7276367311 | | 1996 | 2,735.4410371131 | | 1995 | 2,538.6445462266 | | 1994 | 2,498.9445315798 | | 1993 | 2,494.42447523 | | 1992 | 3,166.9294513629 | | 1991 | 4,022.5326621553 | | 1990 | 4,023.432070307 |
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