Year	US Dollars
1960	0.05458
1961	0.04401
1962	6.27349
1963	13.04253
1964	6.26547
1965	20.43833
1966	13.11984
1967	14.25193
1968	10.22247
1969	7.90268
1970	7.84875
1971	5.30453
1972	5.19387
1973	4.03613
1974	3.30215
1975	3.96949
1976	4.63773
1977	2.80145
1978	3.67759
1979	8.17652
1980	12.31627
1981	11.04627
1982	16.37246
1983	9.97525
1984	23.44278
1985	26.03073
1986	10.71659
1987	17.09918
1988	16.02966
1989	18.83945
1990	12.75213
1991	10.6397
1992	10.7387
1993	0.5425
1994	7.59328
1995	13.69929
1996	10.32286
1997	7.91649
1998	12.96769
1999	22.05228
2000	7.17732
2001	13.52976
2002	18.30792
2003	9.6089
2004	11.51261
2005	10.36578
2006	8.07827
2007	15.38256
2008	18.62238
2009	14.47234
2010	19.82558
2011	24.49782
2012	25.93192
2013	14.46384
2014	16.16496
2015	26.90414
2016	16.78446
2017	11.05544
2018	8.29499
2019	12.03101
2020	34.02468
2021	40.2568