Year	current US$
2001	25758264270.6093
2002	28461296056.799
2003	34306359733.4452
2004	45484457473.2278
2005	52684189927.2922
2006	63272000857.8447
2007	94931082573.4743
2008	116961632906.122
2009	112246295366.137
2010	125538852913.687
2011	146208712756.648
2012	158355750465.383
2013	184697363940.556
2014	178178985241.372
2015	169349920215.148
2016	141256243033.443
2017	147413606488.26