Year	current US$
1987	1200000.047683716
1988	5599999.964237213
1989	37799999.73997477
1990	56780000.49851838
1991	70789999.3285536
1992	77520001.16184361
1993	44959999.33965498
1994	25650000.37848949
1995	42550000.42915344
1996	80700000.44628976
1997	132430000.25860967
1998	57229999.560862705
1999	55720000.74014063
2000	47389999.33376915
2001	45519999.83377759
2002	71639999.06182289
2003	68830000.63523656
2004	90009999.59744506
2005	221740002.26706237
2006	41039999.78303909
2007	251970000.79788277
2008	366760000.94786286
2009	482310004.7148766
2010	457880010.5731932
2011	195149998.4636902
2012	79159999.54566364
2013	40779999.44053592
2014	33330000.25153162
2015	14010000.398382539
2016	18550000.31553209
2017	31650000.05625188
2018	30189999.379217632
2019	23340000.23640689