Year	current US$
1974	128.06829909650176
1975	115.29258453909071
1976	145.26839406700125
1977	98.57105117337524
1978	205.76654448982217
1979	45.18256255566877
1980	87.13450348168071
1981	55.29490669887975
1982	30.434085794620266
1983	19.415491274863477
1984	17.129153528093575
1985	3.2843804390758313
1986	88.75873073260779
1987	94.90791147217594
1988	504.67524430572297
1989	49.42140867379822
1990	114.88070117711376
1991	-10.607168677957207
1992	0
1993	-15.313935959273254
1994	-32.46546504954198
1995	-17.376988989922655
1996	-59.36713959729104