Year	current US$
1995	320000000
1996	298000000
1997	318000000
1998	327000000
1999	395000000
2000	425000000
2001	423000000
2002	550000000
2003	492000000
2004	528000000
2005	574000000
2006	639000000
2007	671000000
2008	704000000
2009	597000000
2010	684000000
2011	899000000
2012	975000000
2013	1001000000
2014	758000000
2015	4939000000
2016	3267000000
2017	3178000000
2018	2522000000
2019	2637000000