| Year | Value | | 2021 | 14,810.010949198 | | 2020 | 14,427.548902003 | | 2019 | 15,936.727920195 | | 2018 | 15,332.939752825 | | 2017 | 15,074.276526635 | | 2016 | 14,620.674420792 | | 2015 | 14,354.40054625 | | 2014 | 14,373.321384915 | | 2013 | 14,355.375417063 | | 2012 | 14,181.485197126 | | 2011 | 13,909.897628942 | | 2010 | 14,280.943458939 | | 2009 | 13,934.250662124 | | 2008 | 14,767.144494547 | | 2007 | 14,667.276888995 | | 2006 | 13,015.401661772 | | 2005 | 12,095.236171265 | | 2004 | 11,030.803777475 | | 2003 | 10,311.723118274 | | 2002 | 10,077.289373487 | | 2001 | 9,986.6995142109 | | 2000 | 10,076.46527831 | | 1999 | 9,765.1890094066 | | 1998 | 9,415.73973338 | | 1997 | 8,331.1151573565 | | 1996 | 7,860.9624104098 | | 1995 | 7,409.2707623243 | | 1994 | 7,343.9714591244 | | 1993 | 7,074.5358914855 | | 1992 | 6,758.0950287735 | | 1991 | 6,940.5392990766 | | 1990 | 6,890.5077661686 | | 1989 | 6,967.6052053374 | | 1988 | 6,231.952283609 | | 1987 | 5,845.3436755621 | | 1986 | 5,328.4949034018 |
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