Year	current US$
1996	97000000
1997	157000000
1998	147000000
1999	96000000
2000	91000000
2001	110000000
2002	137000000
2003	164000000
2004	197000000
2005	273000000
2006	368000000
2007	453000000
2008	562000000
2009	421000000
2010	392000000
2011	368000000
2012	432000000
2013	537000000
2014	409000000
2015	307000000
2016	336000000
2017	415000000
2018	388000000
2019	390000000
2020	132000000