Year	constant 2021 US$
1985	39840000.1525879
1986	98540000.9155273
1987	42430000.3051758
1988	37709999.0844727
1989	50310001.373291
1990	52360000.6103516
1991	43479999.5422363
1992	47919998.1689453
1993	41189998.626709
1994	29000000
1995	35450000.762939505
1996	27979999.5422363
1997	40330001.8310547
1998	18040000.915527303
1999	-12149999.6185303