Year	US Dollars adjusted for inflation)
1960	6132000000
1961	6290000000
1962	6130000000
1963	9360000000
1964	12316000000
1965	11301000000
1966	8402000000
1967	7236000000
1968	8405000000
1969	11806000000
1970	8980000000
1971	11742000000
1972	10808000000
1973	12031000000
1974	12904000000
1975	15858000000
1976	15798000000
1977	14510000000
1978	13899000000
1979	9909000000
1980	10738000000
1981	13628000000
1982	13988000000
1983	13950000000
1984	11864000000
1985	10781000000
1986	11604000000
1987	12180000000
1988	11858000000
1989	11314000000
1990	10606000000
1991	12489000000
1992	14090000000
1993	13770000000
1994	11480000000
1995	11182000000
1996	10839000000
1997	14500000000
1998	15708000000
1999	11543000000
2000	7651000000
2001	5592000000
2002	4853000000
2003	5624000000
2004	6834000000
2005	6766000000
2006	7552000000
2007	7972000000
2008	7144000000
2009	7202000000
2010	8336000000
2011	8941000000
2012	8999000000
2013	7607000000
2014	9588000000
2015	9918000000
2016	9769000000
2017	11732000000
2018	9674000000
2019	10888000000
2020	9426000000
2021	10994000000
2022	14515000000