Year	US Dollars
1960	10.0557
1961	6.71622
1963	5.26811
1966	1.56515
1967	0.6218
1968	0.72984
1969	0.29116
1970	0.84923
1971	0.96065
1972	0.36193
1973	0.48419
1974	0.12132
1975	0.081
1979	0.08143
1980	18.05716
1981	0.04021
1982	2.80492
1983	2.10326
1984	1.62695
1985	1.45985
1986	1.20204
1987	0.44899
1988	1.07866
1989	0.97825
1990	0.65672
1991	0.33113
1992	0.34912
1993	0.4728
1994	0.74593
1995	-10.1099
1996	0.7915
1997	0.87442
1998	1.19396
1999	0.75202