Year	US Dollars adjusted for inflation)
1960	195000000
1961	180000000
1962	132000000
1963	218000000
1964	283000000
1965	631000000
1966	570000000
1967	130000000
1968	357000000
1969	499000000
1970	93000000
1971	235000000
1972	373000000
1973	253000000
1974	450000000
1975	654000000
1976	556000000
1977	1198000000
1978	376000000
1979	1349000000
1980	914000000
1981	887000000
1982	677000000
1983	496000000
1984	524000000
1985	764000000
1986	869000000
1987	771000000
1988	1220000000
1989	1849000000
1990	1214000000
1991	921000000
1992	795000000
1993	1024000000
1994	1029000000
1995	1965000000
1996	1984000000
1997	1230000000
1998	1417000000
1999	1636000000
2000	1399000000
2001	774000000
2002	470000000
2003	752000000
2004	1051000000
2005	799000000
2006	1657000000
2007	1728000000
2008	1689000000
2009	796000000
2010	1297000000
2011	1568000000
2012	1076000000
2013	189000000
2014	738000000
2015	256000000
2016	1038000000
2017	962000000
2018	1140000000
2019	1495000000
2020	1276000000
2021	798000000
2022	408000000