Year	current US$
1977	39717770.855540894
1978	42269818.70089006
1979	52689211.91402274
1980	12798419.451879907
1981	56541917.23940044
1982	7265081.2170808185
1983	48629686.05902256
1984	45050896.44594035
1985	99201132.49209961
1986	96861813.93246222
1987	100097531.0931213
1988	133671936.18102232
1989	147537538.9817143
1990	156744227.62891176
1991	131417822.94094011
1992	138938888.13083458
1993	160162339.96422288
1994	128460332.80278455