Year	current US$
1995	165000000
1996	115000000
1997	193000000
1998	181000000
1999	149000000
2000	138000000
2001	119000000
2002	110000000
2003	120000000
2004	140000000
2005	188000000
2006	256000000
2007	381000000
2008	456000000
2009	488000000
2010	856000000
2011	1778000000
2012	2617000000
2013	3032000000
2014	3163000000
2015	2743000000
2016	2593000000
2017	2803000000
2018	2453000000
2019	1839000000
2020	439000000