Year	current US$
1995	241000000
1996	258000000
1997	382000000
1998	153000000
1999	632000000
2000	668000000
2001	708000000
2002	3750000000
2003	3842000000
2004	4093000000
2005	3724000000
2006	4684000000
2007	6809000000
2008	7566000000
2009	7805000000
2010	9655000000
2011	9775000000
2012	7825000000
2013	8839000000
2014	9452000000
2015	8992000000
2016	10233000000
2017	11507000000
2018	8695000000