Year	current US$
1977	19999.9995529652
1980	230000.004172325
1981	90000.0035762787
1982	70000.0002980232
1983	29999.999329447703
1984	29999.999329447703
1985	39999.9991059303
1986	19999.9995529652
1987	19999.9995529652
1988	19999.9995529652
1989	19999.9995529652
1990	9999.99977648258
1992	0
1993	0