Year	current US$
1995	1495000000
1996	1396000000
1997	1537000000
1999	4014000000
2000	4564000000
2001	4190000000
2002	2456000000
2003	2441000000
2004	2882000000
2005	3044000000
2006	3005000000
2007	3430000000
2008	3946000000
2009	4122000000
2010	3400000000
2011	3809000000
2012	3005000000
2013	3768000000
2014	4003000000
2015	3535000000
2016	3412000000
2017	3306000000
2018	3910000000
2019	4211000000
2020	1500000000