Year	current US$
1995	173000000
1996	185000000
1997	211000000
1998	223000000
1999	181000000
2000	154000000
2001	130000000
2002	117000000
2003	115000000
2004	121000000
2005	130000000
2006	144000000
2007	184000000
2008	214000000
2009	231000000
2010	261000000
2011	308000000
2012	363000000
2013	425000000
2014	448000000
2015	494000000
2016	512000000
2017	545000000
2018	549000000
2019	552000000
2020	226000000