Year	US Dollars
1960	1.1335
1961	1.12044
1962	1.27398
1963	1.02591
1964	0.8242
1965	1.35475
1966	2.64431
1967	4.03249
1968	4.39105
1969	4.11413
1970	3.9665
1971	4.35255
1972	4.30448
1973	4.20206
1974	5.73621
1975	10.35141
1976	11.52466
1977	12.36665
1978	20.66832
1979	21.09413
1980	25.50716
1981	24.0504
1982	25.74172
1983	28.12604
1984	26.99247
1985	27.28006
1986	31.09757
1987	25.9356
1988	34.00971
1989	31.86826
1990	35.80253
1991	42.38773
1992	28.96827
1993	30.54818
1994	28.45199
1995	25.93691
1996	18.97503
1997	13.75621
1998	17.32253
1999	9.74644
2000	11.84627
2001	14.05688
2002	13.07539
2003	27.24473
2004	20.95131
2005	52.84981
2006	34.47336
2007	25.22679
2008	31.27828
2009	29.6097
2010	27.02608
2011	29.36949
2012	23.35664
2013	19.07887
2014	23.14701
2015	20.85656
2016	17.43157
2017	14.70092
2018	-11.41024
2019	8.79466
2020	9.94388
2021	6.94891