Year	current US$
1995	255000000
1996	242000000
1997	239000000
1998	346000000
1999	377000000
2000	94000000
2001	14000000
2002	14000000
2003	66000000
2004	84000000
2005	52000000
2006	25000000
2007	99000000
2008	146000000
2009	193000000
2010	409000000
2011	615000000
2012	469000000
2013	524000000
2014	412000000
2015	312000000
2016	235000000
2017	225000000
2018	245000000