Year	current US$
1995	7706136851.347289
1996	8212191919.814854
1997	9754126120.012123
1998	10163612601.084528
1999	10997842064.155125
2000	11673553560.21697
2001	12117051681.564875
2002	11138667685.122885
2003	10570368313.146475
2004	11933045882.141111
2005	15135466382.028357
2006	16336629179.100842
2007	19262272817.188446
2008	23378873051.088444
2009	19699819269.524036
2010	22606050289.825245
2011	25127345386.701504
2012	26678269268.93139
2013	29173637333.22456
2014	28986799201.702538
2015	28731492489.80429
2016	29934825116.068295
2017	33720269930.821346
2018	35482399897.28514
2019	36094582024.48739