Year	US Dollars adjusted for inflation)
1971	2000000
1975	17000000
1978	29000000
1979	72000000
1981	15000000
1983	25000000
1984	88000000
1987	81000000
1988	25000000
1989	87000000
1990	44000000
1991	3000000
1992	3000000
1993	11000000
1994	30000000
1996	0
1997	46000000
1998	23000000
1999	11000000
2000	11000000
2002	4000000
2004	65000000
2009	32000000
2010	25000000
2011	13000000
2012	76000000
2013	2000000
2014	4000000
2015	73000000
2016	72000000
2020	24000000
2021	72000000