Year	US Dollars
1960	-0.96046
1961	-1.61861
1962	0.68383
1963	0.85398
1964	1.76276
1965	4.71753
1966	3.5785
1967	3.52839
1968	2.59124
1969	2.50421
1970	3.22805
1971	2.75949
1972	2.59368
1973	5.45425
1974	4.5201
1975	4.18353
1976	4.65413
1977	5.4442
1978	7.97789
1979	11.17111
1980	10.63947
1981	11.27962
1982	8.64737
1983	13.2146
1984	13.87924
1985	15.56672
1986	13.40975
1987	14.38464
1988	13.25637
1989	14.29086
1990	17.96319
1991	29.45445
1992	18.93198
1993	24.5387
1994	14.47718
1995	15.82679
1996	13.31738
1997	15.86177
1998	19.08807
1999	17.49489
2000	15.48222
2001	17.06798
2002	18.2019
2003	18.43224
2004	17.17507
2005	16.53518
2006	16.20446
2007	11.23551
2008	16.47528
2009	15.26923
2010	-10.2256
2011	20.03954
2012	12.96018
2013	12.10634
2014	10.81573
2015	10.9023
2016	10.28498
2017	-0.03987
2018	13.99922
2019	13.98056
2020	14.66848
2021	9.00625