Year	US Dollars adjusted for inflation)
1974	1000000
1975	241000000
1976	181000000
1977	105000000
1978	146000000
1979	111000000
1980	153000000
1981	241000000
1982	379000000
1983	574000000
1984	479000000
1985	528000000
1986	703000000
1987	1186000000
1988	965000000
1989	152000000
1990	140000000
1993	122000000
1994	111000000
1995	1000000
1996	44000000
1997	7000000
1998	149000000
1999	358000000
2000	147000000
2001	156000000
2002	148000000
2003	48000000
2004	8000000
2005	38000000
2006	7000000
2007	31000000
2008	29000000
2009	20000000
2013	30000000
2014	2000000
2015	49000000
2016	152000000
2017	110000000
2018	272000000
2019	169000000
2020	51000000
2022	46000000