| Year | Value | | 2021 | 12,194.363628164 | | 2020 | 10,801.98354046 | | 2019 | 10,527.7675145 | | 2018 | 10,026.952125069 | | 2017 | 8,658.807083659 | | 2016 | 7,538.8659461542 | | 2015 | 7,210.6544322861 | | 2014 | 8,035.8455810155 | | 2013 | 7,498.9745127915 | | 2012 | 7,016.9963232189 | | 2011 | 7,534.1161934221 | | 2010 | 6,749.9968289645 | | 2009 | 6,961.1150234445 | | 2008 | 8,526.6092611863 | | 2007 | 6,573.7789876148 | | 2006 | 4,513.1459769131 | | 2005 | 3,585.4286188496 | | 2004 | 2,628.1379047304 | | 2003 | 2,008.7800916593 | | 2002 | 1,585.298154666 | | 2001 | 1,408.8309911666 | | 2000 | 1,282.5884380944 | | 1999 | 1,226.4344932826 | | 1998 | 1,422.1915433004 | | 1997 | 1,158.9871396348 | | 1996 | 1,162.1881649683 | | 1995 | 1,196.829328738 | | 1994 | 968.62905286365 | | 1993 | 845.10298885588 | | 1992 | 813.86298828322 | | 1991 | 929.77162442014 | | 1990 | 1,204.0582660873 | | 1989 | 1,302.0564238081 |
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