Year	US Dollars
1973	4730000.01907
1974	67029998.7793
1975	8079999.92371
1976	1500000
1977	2769999.98093
1978	1700000.04768
1979	6889999.86649
1980	21459999.08447
1981	25989999.77112
1982	37630001.06812
1983	29020000.45776
1984	40490001.67847
1985	45029998.7793
1986	42669998.16895
1987	100599998.47412
1988	81290000.91553
1989	99580001.83105
1990	89610000.61035
1991	90099998.47412
1992	82819999.69482
1993	76230003.35693
1994	41869998.93188
1995	42639999.38965
1996	40439998.62671
1997	35139999.38965
1998	32869998.93188
1999	30010000.22888
2000	35909999.84741
2001	22889999.38965
2002	31270000.45776
2003	26709999.08447
2004	32889999.38965
2005	41740001.67847
2006	27540000.91553
2007	29270000.45776
2008	28620000.83923
2009	28579999.92371
2010	81120002.74658
2011	21659999.84741
2012	13800000.19073
2013	4250000
2014	319999.99285
2015	8060000.41962
2016	7469999.79019
2017	7300000.19073
2018	6750000
2019	64510002.13623
2020	5949999.80927
2021	12100000.38147