Year	US Dollars
2008-01-01	775000000000
2009-01-01	667000000000
2010-01-01	482000000000
2011-01-01	559000000000
2012-01-01	623000000000
2013-01-01	690000000000
2014-01-01	697000000000
2015-01-01	709000000000
2016-01-01	818000000000
2017-01-01	765000000000
2018-01-01	797000000000
2019-01-01	822000000000
2020-01-01	874000000000
2021-01-01	931000000000