Year	current US$
1995	247000000
1996	274000000
1997	396000000
1998	155000000
1999	638000000
2000	671000000
2001	714000000
2002	3990000000
2003	4120000000
2004	4402000000
2005	4112000000
2006	5066000000
2007	7335000000
2008	8270000000
2009	8503000000
2010	10570000000
2011	10555000000
2012	8435000000
2013	9464000000
2014	10130000000
2015	9658000000
2016	11142000000
2017	12568000000
2018	9271000000