Year	constant 2015 US$
1992	28800000
1993	140060000
1994	211320000
1995	312850000
1996	267660000
1997	305050000
1998	311740000
1999	352130000
2000	274790000
2001	257950000
2002	254150000
2003	238040000
2004	290400000
2005	285390000
2006	325410000
2007	267710000
2008	327140000
2009	294710000
2010	351440000
2011	458690000
2012	407540000
2013	453430000
2014	510730000
2015	754160000
2016	515960000
2017	435410000