Year	U.S. Dollars
2009-01-01	11697700000
2010-01-01	11508200000
2011-01-01	14986500000
2012-01-01	17758200000
2013-01-01	19110300000
2014-01-01	19286900000
2015-01-01	16333400000
2016-01-01	14430100000
2017-01-01	11807400000
2018-01-01	12774700000
2019-01-01	13506000000