Year	US Dollars
1960	2.11992
1961	14.89499
1962	15.89773
1963	15.27841
1964	12.63336
1965	11.73772
1966	13.47683
1967	9.96326
1968	7.99241
1969	7.7276
1970	5.77059
1971	2.74228
1972	3.75625
1973	3.8592
1974	1.44948
1975	10.62923
1976	0.96438
1977	0.97722
1978	0.33759
1979	-2.64412
1980	-0.65825
1981	0.04726
1982	-0.06945
1983	0.71223
1984	0.95079
1985	4.00523
1986	0.29805
1987	2.27173
1988	4.01985
1989	5.23437
1990	8.17965
1991	9.21549
1992	9.91272
1993	12.76719
1994	10.92137
1995	11.1495
1996	13.45149
1997	8.82757
1998	7.17222
1999	4.69017
2000	3.29212
2001	3.5983
2002	-0.4505
2003	5.06523
2004	3.37808
2005	10.55621
2006	6.05403
2007	6.44174
2008	6.17833
2009	4.51244
2010	10.69797
2011	9.38651
2012	7.38564
2013	4.60082
2014	13.88469
2015	3.04027
2016	9.86735
2017	3.82773