| Year | Value | | 2020 | 34,318.677221497 | | 2019 | 41,217.325314866 | | 2018 | 42,283.679138059 | | 2017 | 39,650.738061327 | | 2016 | 37,885.642214276 | | 2015 | 38,036.417301544 | | 2014 | 41,970.945381587 | | 2013 | 40,608.355064005 | | 2012 | 39,212.051068137 | | 2011 | 35,985.482229206 | | 2010 | 30,466.452539211 | | 2009 | 27,082.114973651 | | 2008 | 38,058.275674285 | | 2007 | 38,298.290426257 | | 2006 | 38,567.601007664 | | 2005 | 35,772.772429216 | | 2004 | 32,571.260168493 | | 2003 | 28,612.659526478 | | 2002 | 26,933.272561677 | | 2001 | 27,748.866268581 | | 2000 | 29,091.277700371 |
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