Year	current US$
2003	408000000
2004	520000000
2005	437000000
2006	476000000
2007	580000000
2008	498000000
2009	383000000
2010	165000000
2011	252000000
2012	525000000
2013	540000000
2014	312000000
2015	230000000
2016	329000000
2017	476000000
2018	294000000
2019	124000000
2020	16000000