Year	current US$
1995	473000000
1996	388000000
1997	369000000
1998	966000000
1999	932000000
2000	1074000000
2001	994000000
2002	1096000000
2003	1621000000
2004	2202000000
2005	2412000000
2006	2612000000
2007	3713000000
2008	4306000000
2009	3776000000
2010	3343000000
2011	3764000000
2012	3462000000
2013	3829000000
2014	3927000000
2015	3139000000
2016	3637000000
2017	4099000000
2018	4468000000
2019	4287000000
2020	1636000000