Year	US Dollars
1971	180000.00715
1973	2900000.09537
1974	9069999.69482
1975	6010000.22888
1977	7000000
1978	14239999.77112
1979	10569999.69482
1980	11020000.45776
1981	13579999.92371
1982	11109999.65668
1983	11140000.34332
1984	11369999.88556
1986	2059999.94278
1987	3579999.92371
1988	3329999.92371
1990	6789999.96185
1992	1379999.99523
1993	105150001.52588
1994	222320007.32422
1995	195509994.50684
1996	210960006.71387
1997	171699996.94824
1998	238940002.44141
1999	218080001.83105
2000	275089996.33789
2001	451220001.2207
2002	334029998.7793
2003	412339996.33789
2004	322130004.88281
2005	416450012.20703
2006	135300003.05176
2007	158369995.11719
2008	139500000
2009	142050003.05176
2010	161490005.49316
2011	119459999.08447
2012	129479995.72754
2013	76750000
2014	79550003.05176
2015	100330001.83106
2016	71519996.64307
2017	83230003.35693
2018	84809997.55859
2019	273579986.57227
2020	60830001.83105
2021	39279998.7793