Year	US Dollars
1974	128.0683
1975	115.29258
1976	145.26839
1977	98.57105
1978	205.76654
1979	45.18256
1980	87.1345
1981	55.29491
1982	30.43409
1983	19.41549
1984	17.12915
1985	3.28438
1986	88.75873
1987	94.90791
1988	504.67524
1989	49.42141
1990	114.8807
1991	-10.60717
1992	0
1993	-15.31394
1994	-32.46547
1995	-17.37699
1996	-59.36714