Year	current US$
1970	13985000.0745
1971	20255154.0354
1972	24194312.7354
1973	27700163.9784
1974	31150866.9996
1975	40138000.188
1976	41167179.68
1977	43206826.3096
1978	47987832.8588
1979	56763930.0663767
1980	68094257.6616
1981	76889064.2296
1982	77899531.3672
1983	85786785.7528233
1984	92195770.1288
1985	92663578.9888
1986	96892571.0832
1987	107390207.889553
1988	112704516.539153
1989	125737668.384777