Year	U.S. Dollars
2008-01-01	13138700000
2009-01-01	8487300000
2010-01-01	12958500000
2011-01-01	11827700000
2012-01-01	6280700000
2013-01-01	6468400000
2014-01-01	6438100000
2015-01-01	5519000000
2016-01-01	5061100000
2017-01-01	5760700000
2018-01-01	6049100000
2019-01-01	6577900000