Year	US Dollars
1963	-0.39254
1966	0.1368
1967	0.12119
1969	0.38271
1970	0.50844
1971	0.75134
1972	1.34827
1973	1.83224
1974	2.84441
1975	3.94785
1976	5.97185
1977	3.69756
1978	0.57466
1979	0.65292
1980	1.9463
1981	2.88246
1982	2.75105
1983	3.17745
1984	3.81919
1985	5.0838
1986	6.14655
1987	7.12145
1988	4.44022
1989	11.68903
1990	6.7244
1991	6.30907
1992	6.19572
1993	7.75655
1994	6.43122
1995	7.26026