Year	US Dollars
2002	410000000
2003	585000000
2004	734000000
2005	1040000000
2006	765000000
2007	1533000000
2008	240000000
2009	122000000
2010	580000000
2011	100000000
2012	164000000
2013	-231000000
2014	-230000000
2015	-21000000