Year	US Dollars
2008-01-01	6330000000000
2009-01-01	8520000000000
2010-01-01	6450000000000
2011-01-01	5640000000000
2012-01-01	7820000000000
2013-01-01	3790000000000
2014-01-01	3790000000000
2015-01-01	4000000000000
2016-01-01	4300000000000
2017-01-01	4610000000000
2018-01-01	4950000000000
2019-01-01	5320000000000
2020-01-01	5710000000000
2021-01-01	6110000000000