Year	current US$
2004	33109257689.6462
2005	56231296407.0222
2006	80877913732.5135
2007	101252329736.401
2008	171030010674.938
2009	80663100306.4929
2010	142026491821.287
2011	147867124564.109
2012	183094163364.892
2013	133388424523.362
2014	109755610074.78
2015	47179429441.2554
2016	14337088691.2482
2017	43348585042.8396
2018	75652590862.4487