Year	current US$
2005	3740913181.0212836
2006	3330140913.095004
2007	2214326417.5510178
2008	2897307942.0164976
2009	876505916.0259212
2010	2549932923.175008
2011	818083120.7988245
2012	2850237012.6404943
2013	1935565645.5789864
2014	4048431992.2684603
2015	-2704502001.741945
2016	-1910045796.0117316