Year	current US$
1997	17114766279663.523
1998	17326696212627.895
1999	18248515724672.332
2000	18688897090879.805
2001	18828647062223.457
2002	19820557080803.184
2003	22166890750620.566
2004	24587344313680.07
2005	26004885650856.434
2006	27404721263096.926
2007	30096416881561.207
2008	32321306934450.562
2009	31150010525470.453
2010	32408667867001.758
2011	34943423401043.133
2012	35229545980941.1
2013	35727402673570.56
2014	36369881843996.29
2015	34514566631904.484
2016	35432597716935.266
2017	36953866991726.98
2018	39058092906405.37
2019	39760471563797.96
2020	39173486325470.59
2021	43181838321391.04