Year	current US$
1997	16197936722700.863
1998	16453770801527.133
1999	17379346904165.207
2000	17743986284678.29
2001	17853836265683.46
2002	18797971475141.363
2003	21017548579774.2
2004	23255575396253.38
2005	24482344923958.63
2006	25658304711973.105
2007	27990176132816.03
2008	29852574203716.656
2009	28953850254074.21
2010	29937201353743.836
2011	32028709884509.883
2012	32156223176720.01
2013	32439514834759.094
2014	33096786994485.074
2015	31635606694449.16
2016	32523423203714.355
2017	33717824918531.848
2018	35655915574729.51
2019	36269127146502.54
2020	35808864816084.64
2021	39348958755973.19