Year	US Dollars
1973	50000.00075
1974	15729999.54224
1975	8829999.92371
1976	12010000.22888
1977	18370000.83923
1978	11470000.26703
1979	9180000.30518
1980	13020000.45776
1981	21149999.61853
1982	11800000.19073
1983	8189999.58038
1984	5750000
1985	6840000.15259
1986	10659999.84741
1987	10770000.45776
1988	14930000.30518
1989	7219999.79019
1990	6940000.05722
1991	10250000
1992	6639999.86649
1993	4550000.19073
1994	6030000.20981
1995	2930000.06676
1996	5030000.20981
1997	5900000.09537
1998	12760000.22888
1999	12069999.69482
2000	13649999.61853
2001	11399999.61853
2002	16540000.91553
2003	6500000
2004	1940000.05722
2005	8479999.54224
2006	3509999.99046
2007	4869999.88556
2008	5329999.92371
2009	4099999.90463
2010	18340000.15259
2011	12729999.54224
2012	1879999.99523
2013	1529999.97139
2014	2460000.03815
2015	1700000.04768
2016	0
2017	10850000.38147
2018	17809999.46594
2019	28260000.22888
2020	25829999.92371
2021	5260000.22888