| Year | Value | | 2021 | 19,843.782905675 | | 2020 | 16,844.235107959 | | 2019 | 17,471.655286562 | | 2018 | 17,451.200667876 | | 2017 | 15,315.252111987 | | 2016 | 13,479.639182784 | | 2015 | 12,903.368094771 | | 2014 | 14,284.856685489 | | 2013 | 14,511.859549835 | | 2012 | 14,334.3443049 | | 2011 | 15,447.399675161 | | 2010 | 14,232.531464553 | | 2009 | 14,319.404179344 | | 2008 | 16,823.853887349 | | 2007 | 13,667.796777466 | | 2006 | 11,309.7852498 | | 2005 | 10,122.688799203 | | 2004 | 8,761.8907543521 | | 2003 | 7,403.9951261897 | | 2002 | 6,065.4208876404 | | 2001 | 5,013.5796338462 | | 2000 | 4,584.3059281426 | | 1999 | 4,843.7187264726 | | 1998 | 5,004.3773191662 | | 1997 | 4,648.3701857136 | | 1996 | 5,106.750493621 | | 1995 | 4,562.8381609041 | | 1994 | 3,678.5348495249 | | 1993 | 3,140.714534311 |
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