Year	current US$
1970	629802.405602942
1971	18918013.3920437
1972	20802262.8229225
1973	27481969.107726
1974	1673040.67979893
1975	2312001.22305339
1976	59316820.806638
1977	64250443.9496894
1978	81453105.8952561
1979	98419984.3731597
1980	106956257.664265
1981	100016582.06715
1982	100110129.960617
1983	104021125.666613
1984	5647382.01136406
1985	5902466.97285764
1986	8605847.19713807
1987	9923131.9424117
1988	9587900.37794332
1989	9111306.8496505
1990	12101728.579319
1991	12696990.9425011
1992	23001874.5992233
1993	22111072.2467148
1994	22930698.7798633
1995	26326380.4505374
1996	26252142.0425703
1997	23330485.2065049
1998	23890573.4514327
1999	23726319.6880843
2000	21553187.1665926