Year	US Dollars adjusted for inflation)
1972	141000000
1979	105000000
1980	105000000
1981	130000000
1982	65000000
1984	126000000
1985	28000000
1986	73000000
1988	54000000
1989	48000000
1990	72000000
1991	118000000
1993	60000000
1994	7000000
1995	27000000
1996	24000000
1997	25000000
1998	32000000
2000	10000000
2001	235000000
2003	96000000
2004	74000000
2005	109000000
2006	158000000
2007	278000000
2008	110000000
2009	224000000
2010	177000000
2011	328000000
2012	203000000
2013	350000000
2014	220000000
2015	94000000
2016	473000000
2017	738000000
2018	1054000000
2019	682000000
2020	772000000
2021	544000000
2022	209000000