Year	current US$
2004	158000000
2005	185000000
2006	196000000
2007	220000000
2008	315000000
2009	351000000
2010	464000000
2011	540000000
2012	642000000
2013	349000000
2014	342000000
2015	278000000
2016	309000000
2017	365000000
2018	497000000
2019	596000000
2020	268000000