| Year | Value | | 2014 | 5,600.2084648651 | | 2013 | 5,345.4684265863 | | 2012 | 5,180.6535100753 | | 2011 | 4,892.7348956666 | | 2010 | 4,728.0115908273 | | 2009 | 4,447.3244033893 | | 2008 | 4,658.5718977916 | | 2007 | 4,487.2861302676 | | 2006 | 4,261.2122940263 | | 2005 | 4,012.0739189184 | | 2004 | 3,859.1928160318 | | 2003 | 3,768.7925677739 | | 2002 | 3,558.3272786203 | | 2001 | 3,512.035500613 | | 2000 | 3,169.5233406161 | | 1999 | 2,838.3533263569 | | 1998 | 2,948.7169279521 | | 1997 | 3,173.6477548363 | | 1996 | 3,636.5499103332 | | 1995 | 4,040.9723092899 | | 1994 | 4,327.1406262174 | | 1993 | 4,527.8972681951 | | 1992 | 5,354.4918379023 | | 1991 | 5,641.4193028312 | | 1990 | 5,905.0036701737 |
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