Year	US Dollars
1961	19750000
1967	3259999.99046
1974	39999.99911
1975	860000.01431
1976	1549999.95232
1978	39999.99911
1979	1059999.94278
1980	870000.00477
1981	639999.98569
1982	569999.99285
1983	1039999.96185
1986	620000.00477
1988	29999.99933
1990	159999.99642
1991	1320000.05245
1992	209999.99344
1993	660000.02623
1994	330000.01311
1995	19999.99955
1996	119999.99732
1997	689999.99762
1998	2509999.99046
1999	267809997.55859
2000	399820007.32422
2001	344980010.98633
2002	356600006.10352
2003	237889999.38965
2004	198330001.83105
2005	214009994.50684
2006	237320007.32422
2007	287670013.42773
2008	267869995.11719
2009	217899993.89648
2010	272859985.35156
2011	240029998.7793
2012	251110000.61035
2013	230750000
2014	231270004.27246
2015	225389999.38965
2016	235279998.7793
2017	236419998.16895
2018	207100006.10352
2019	234119995.11719
2020	249679992.67578
2021	232770004.27246