Year	US Dollars adjusted for inflation)
1960	435000000
1961	493000000
1962	524000000
1963	337000000
1964	379000000
1965	484000000
1966	367000000
1967	262000000
1968	91000000
1969	105000000
1970	18000000
1971	42000000
1972	34000000
1973	54000000
1974	89000000
1975	395000000
1976	480000000
1977	260000000
1978	196000000
1979	455000000
1980	533000000
1981	554000000
1982	411000000
1983	331000000
1984	528000000
1985	347000000
1986	345000000
1987	312000000
1988	370000000
1989	319000000
1990	468000000
1991	497000000
1992	452000000
1993	235000000
1994	176000000
1995	146000000
1996	195000000
1997	126000000
1998	214000000
1999	282000000
2000	186000000
2001	221000000
2002	178000000
2003	198000000
2004	279000000
2005	266000000
2006	310000000
2007	308000000
2008	471000000
2009	238000000
2010	260000000
2011	326000000
2012	235000000
2013	194000000
2014	337000000
2015	482000000
2016	217000000
2017	175000000
2018	243000000
2019	215000000
2020	174000000
2021	118000000
2022	175000000