Year	current US$
2007	665000000
2008	667000000
2009	619000000
2010	681000000
2011	729000000
2012	854000000
2013	871000000
2014	922000000
2015	913000000
2016	871000000
2017	646000000
2018	468000000
2019	708000000
2020	243000000