Year	current US$
1995	332000000
1996	339000000
1997	391000000
2000	381000000
2001	338000000
2002	243000000
2003	236000000
2004	267000000
2005	331000000
2006	305000000
2007	354000000
2008	466000000
2009	442000000
2010	549000000
2011	797000000
2012	1043000000
2013	1486000000
2014	1559000000
2015	1384000000
2016	1079000000
2017	1222000000
2018	1252000000
2019	1424000000
2020	412000000