Year	current US$
1977	11506853.1
1978	8322407.721999999
1979	8546380.043
1980	4113034.248
1981	592496.7527
1982	663407.9218
1983	2962741.137
1984	6741096.497
1985	10519452.1
1986	17663574.22
1987	25324705.12
1988	35219280.24
1989	31199815.75
1990	38932687.8427467
1991	38800893.0593683
1992	46903606.2499675
1993	40948207.2824501
1994	15421339.3132209