Year	US Dollars
1966	6.70876
1967	2.46616
1968	3.54307
1969	5.40329
1970	9.61072
1971	18.85703
1972	19.30518
1973	18.96641
1974	14.60234
1975	17.48351
1976	23.31303
1977	18.74527
1978	35.37722
1979	25.36321
1980	28.03904
1981	41.42388
1982	33.48433
1983	63.5855
1984	22.15494
1985	23.45771
1986	17.45559
1987	18.3643
1988	7.07214
1989	3.82595
1990	8.80758
1991	8.94365
1992	4.91907
1993	19.08083
1994	11.08088
1995	1.94432
1996	21.80423
1997	22.18643
1998	65.16413
1999	-2.23341
2000	6.80126
2001	1.20583
2002	17.82665
2003	79.51432
2004	112.84706
2005	-2.33786
2006	-3.29112
2007	68.89082
2008	34.03818
2009	42.91595
2010	56.71415