| Year | Value | | 2021 | 43,494.502000316 | | 2020 | 37,501.00899771 | | 2019 | 37,723.849452507 | | 2018 | 36,072.484398268 | | 2017 | 34,950.814950635 | | 2016 | 31,762.582252484 | | 2015 | 30,461.962408095 | | 2014 | 32,314.159103684 | | 2013 | 30,702.812454835 | | 2012 | 27,194.703453465 | | 2011 | 28,664.638594478 | | 2010 | 25,869.420680369 | | 2009 | 23,010.015176206 | | 2008 | 24,640.182329497 | | 2007 | 21,284.105690416 | | 2006 | 18,552.863673751 | | 2005 | 17,305.264207298 | | 2004 | 16,385.318761203 | | 2003 | 15,551.56968655 | | 2002 | 15,128.812940791 | | 2001 | 16,734.64857659 | | 2000 | 17,005.356066116 | | 1999 | 15,722.475755785 | | 1998 | 16,355.791051334 | | 1997 | 16,610.0013239 | | 1996 | 16,474.738562322 | | 1995 | 15,551.400824621 |
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