| Year | Value | | 2021 | 5,812.0217405146 | | 2020 | 5,200.944074921 | | 2019 | 5,563.1130087608 | | 2018 | 5,139.3847229326 | | 2017 | 4,690.7796124857 | | 2016 | 4,055.4795204696 | | 2015 | 4,824.4194781716 | | 2014 | 6,842.2552247195 | | 2013 | 6,490.2711269315 | | 2012 | 5,735.8310901789 | | 2011 | 5,460.2958952556 | | 2010 | 5,017.310263397 | | 2009 | 4,480.5080006059 | | 2008 | 5,353.0190603581 | | 2007 | 4,001.6820902138 | | 2006 | 3,274.4913934903 | | 2005 | 2,676.1372739518 | | 2004 | 2,024.7221837092 | | 2003 | 1,558.5848720787 | | 2002 | 1,261.966857214 | | 2001 | 1,057.5663101062 | | 2000 | 1,077.7234166209 | | 1999 | 1,021.4840727784 | | 1998 | 1,284.1860511479 | | 1997 | 1,174.4516723392 | | 1996 | 1,228.2037148511 | | 1995 | 1,161.4894453129 | | 1994 | 1,255.8368473142 | | 1993 | 1,366.9057239299 | | 1992 | 1,418.2685320397 |
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