Year	current US$
1968	430000.00715255697
1969	860000.014305115
1970	1639999.98569489
1971	2470000.02861023
1972	2539999.96185303
1973	1840000.0333786
1974	910000.026226044
1975	1149999.97615814
1976	689999.997615814
1977	740000.009536743
1978	949999.988079071
1979	949999.988079071
1980	1440000.0572204601
1981	1929999.94754791
1982	1500000
1983	1279999.97138977
1984	600000.023841858
1985	860000.014305115
1986	980000.019073486
1987	509999.99046325695
1988	740000.009536743
1989	389999.98569488496
1990	270000.010728836
1991	129999.995231628
1992	-9999.99977648258