Year	US Dollars
1973	560000.00238
1974	18639999.38965
1975	25520000.45776
1976	18559999.46594
1977	14939999.58038
1978	15390000.34332
1979	16170000.07629
1980	23209999.08447
1981	22430000.30518
1982	19139999.38965
1983	13579999.92371
1984	10189999.58038
1985	13939999.58038
1986	26379999.16077
1987	25059999.46594
1988	28450000.76294
1989	24760000.22888
1990	23350000.38147
1991	23120000.83923
1992	25069999.69482
1993	19250000
1994	15619999.88556
1995	58250000
1996	32639999.38965
1997	6539999.96185
1998	28700000.76294
1999	21260000.22888
2000	8000000
2001	12810000.41962
2002	6389999.86649
2003	7760000.22888
2004	11130000.11444
2005	8520000.45776
2006	5199999.80927
2007	64650001.52588
2008	24750000
2009	27729999.54224
2010	16500000
2011	16120000.83923
2012	7960000.03815
2013	8060000.41962
2014	9260000.22888
2015	14939999.58038
2016	9869999.88556
2017	12329999.92371
2018	18229999.54224
2019	86819999.69482
2020	76120002.74658
2021	119589996.33789