Year	US Dollars
1961	0.09248
1962	0.62392
1963	12.8334
1964	13.17059
1965	17.49129
1966	9.5905
1967	5.74459
1968	4.75354
1969	6.69295
1970	5.44044
1971	3.98948
1972	2.91205
1973	2.18204
1974	3.15296
1975	4.15553
1976	3.56843
1977	1.9414
1978	2.91819
1979	2.99377
1980	3.39584
1981	-2.67788
1982	4.12223
1983	5.07141
1984	4.3638
1985	6.05108
1986	16.11352
1987	28.42196
1988	5.03763
1989	4.08371
1990	13.45421
1991	-1.46526
1992	4.56631
1993	1.10512
1994	15.48341
1995	18.05292
1996	11.49658
1997	25.39883
1998	11.00885
1999	20.29293
2000	-1.17099
2001	-4.61688
2002	-7.00613
2003	-2.31983
2004	-1.11668
2005	-1.76031
2006	8.92572
2007	14.78127
2008	6.67
2009	4.78165
2010	3.07737