Year	current US$
2003	376000000
2004	549000000
2005	657000000
2006	777000000
2007	800000000
2008	733000000
2009	916000000
2010	353000000
2011	436000000
2012	312000000
2013	304000000
2014	203000000
2015	446000000
2016	212000000
2017	117000000
2018	141000000
2019	157000000
2020	28000000