Year	US Dollars
1960	0.01144
1961	0.55239
1962	1.18025
1963	1.1798
1964	3.77444
1965	3.73255
1966	5.28939
1967	5.12775
1968	6.9376
1969	7.34758
1970	6.75417
1971	8.52396
1972	8.77735
1973	14.00369
1974	25.94207
1975	25.70841
1976	22.90359
1977	16.83348
1978	26.71611
1979	28.81671
1980	26.79819
1981	30.05846
1982	39.17468
1983	25.65097
1984	22.62022
1985	41.4101
1986	40.99555
1987	46.44088
1988	47.17964
1989	36.72341
1990	46.30346
1991	42.7997
1992	40.04538
1993	36.82336
1994	39.2855
1995	27.75548
1996	24.83365
1997	31.75373
1998	26.93157
1999	16.67369
2000	18.00018
2001	21.52529
2002	23.74741
2003	37.28609
2004	41.04771
2005	37.754
2006	37.72598
2007	38.62632
2008	39.82161
2009	29.34484
2010	44.5339
2011	37.30057
2012	49.6335
2013	42.74334
2014	47.37659
2015	43.19926
2016	45.52584
2017	56.33933
2018	57.95706
2019	61.40408
2020	79.26065
2021	70.28826