Year	US Dollars
1960	0.46594
1961	0.60391
1962	0.78975
1963	0.63313
1964	6.99007
1965	3.09864
1966	1.02051
1967	1.51115
1968	0.07845
1969	0.0612
1970	0.10437
1971	2.96166
1972	13.92567
1973	30.93617
1974	224.77196
1975	178.01203
1976	206.82433
1977	419.39722
1978	66.41468
1979	253.11646
1980	215.56579
1981	234.28261
1982	119.95069
1983	59.13039
1984	83.58556
1985	57.327
1986	71.94588
1987	29.29531
1988	3.14149
1989	14.40626
1990	37.7939
1991	6.90697
1992	19.96245
1993	62.59086
1994	72.86489
1995	34.56113
1996	37.5256
1997	44.70989
1998	243.7748
1999	22.98279
2000	33.98524
2001	3.49946
2002	32.02201
2003	26.44761
2004	40.64232
2005	7.57
2006	21.11574
2007	82.11997
2008	28.15889
2009	53.56368
2010	-7.49849