Year	U.S. Dollars
2000-01-01	2660000000
2001-01-01	3152300000
2002-01-01	2707300000
2003-01-01	3265700000
2004-01-01	4177200000
2005-01-01	4538700000
2006-01-01	5363800000
2007-01-01	7751100000
2008-01-01	11393300000
2009-01-01	11457400000
2010-01-01	11029400000
2011-01-01	14167200000
2012-01-01	16834100000
2013-01-01	17819600000
2014-01-01	17082400000
2015-01-01	14282000000
2016-01-01	13877000000
2017-01-01	14392700000
2018-01-01	17975400000
2019-01-01	19293900000