Year	current US$
1992	16467307564.917665
1993	19229749470.656326
1994	23760187524.665024
1995	19376052018.832706
1996	10660838808.249943
1997	7560124762.385896
1998	6396721574.2671995
1999	6439634690.646612
2000	7425449925.600998
2001	8683416697.218466
2002	9543316523.255365
2003	10362910322.848515
2004	11967814473.669462
2005	14154519207.42747
2006	16676107082.671923
2007	19016947275.19317
2008	22161202702.7121
2009	24855857887.178753
2010	27870260718.5304
2011	25694362119.020535
2012	30836220079.287445
2013	36138877868.42852
2014	37904121439.66372
2015	31990154386.37723
2016	31072960597.070553
2017	29262776788.81708
2018	25287123599.37422