Year	US Dollars adjusted for inflation)
1960	2246000000
1961	1270000000
1962	1140000000
1963	1283000000
1964	1395000000
1965	1470000000
1966	1369000000
1967	1988000000
1968	1647000000
1969	1790000000
1970	927000000
1971	2252000000
1972	2512000000
1973	2768000000
1974	2353000000
1975	2441000000
1976	2513000000
1977	2208000000
1978	2220000000
1979	1539000000
1980	1589000000
1981	2365000000
1982	2514000000
1983	2596000000
1984	2567000000
1985	2142000000
1986	1973000000
1987	3594000000
1988	2519000000
1989	3515000000
1990	1851000000
1991	1515000000
1992	1098000000
1993	1389000000
1994	1522000000
1995	1460000000
1996	1618000000
1997	2359000000
1998	1387000000
1999	1310000000
2000	1601000000
2001	1359000000
2002	1076000000
2003	769000000
2004	1217000000
2005	1001000000
2006	954000000
2007	920000000
2008	927000000
2009	1073000000
2010	1151000000
2011	1007000000
2012	816000000
2013	1493000000
2014	1658000000
2015	1177000000
2016	1339000000
2017	1117000000
2018	683000000
2019	910000000
2020	625000000
2021	656000000
2022	1504000000