| Year | Value | | 2021 | 1,440.7752071358 | | 2020 | 1,443.9662530592 | | 2019 | 1,563.1040027015 | | 2018 | 1,525.7807914341 | | 2017 | 1,511.6532132956 | | 2016 | 1,479.0212960423 | | 2015 | 1,602.7989537358 | | 2014 | 1,952.5336134539 | | 2013 | 1,867.826598991 | | 2012 | 1,831.1616914903 | | 2011 | 1,633.7649523637 | | 2010 | 1,860.5213933572 | | 2009 | 1,646.4822443712 | | 2008 | 1,789.5072971516 | | 2007 | 1,436.6938627336 | | 2006 | 1,191.4508753156 | | 2005 | 950.36932228792 | | 2004 | 784.12854344026 | | 2003 | 629.56771670486 | | 2002 | 628.67638669508 | | 2001 | 642.41973430378 | | 2000 | 648.39727591822 | | 1999 | 577.50628182104 | | 1998 | 542.67218288118 | | 1997 | 550.840008471 | | 1996 | 485.75004632818 | | 1995 | 494.16220222007 | | 1994 | 393.69244650734 |
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