Year	current US$
1976	192592354.02871
1977	366558254.751422
1978	367024956.138827
1979	475066555.300369
1980	286167215.992126
1981	69621902.828691
1982	94967673.9776583
1983	175776081.761667
1984	261898864.532353
1985	97532061.9080202
1986	185954631.781115
1987	165351665.440917
1988	367109953.4804
1989	84297540.4032453
1990	261542182.750019
1991	445690282.082706
1992	520245508.374309
1993	830781171.23893
1994	1054590529.07412
1995	1205946206.12449
1996	924891352.709708
1997	370814776.476884
1998	438984407.878751
1999	458083078.314958
2000	946573509.774064
2001	684349224.245656
2002	499326300.92092
2003	857937937.948988
2004	952831721.759101