Year	current US$
2004	44363575587.57
2005	47389401438.6729
2006	49984107522.7511
2007	67348430864.7203
2008	79486022433.57
2009	84404838234.6826
2010	94455069463.2606
2011	110166664827.598
2012	123092067735.805
2013	149665248927.001
2014	146716268062.825
2015	149672344024.569
2016	134181559327.659
2017	147054051714.249
2018	153754007293.192