Year	current US$
1960	413000000
1961	358000000
1962	349000000
1963	313000000
1964	415000000
1965	310000000
1966	400000000
1967	365000000
1968	359000000
1969	420000000
1970	386000000
1971	354000000
1972	368000000
1973	430000000
1974	720000000
1975	816000000
1976	585000000
1977	700000000
1978	969000000
1979	1466000000
1980	2037000000
1981	1849000000
1982	1831000000
1983	1820000000
1984	1867000000
1985	1843000000
1986	1857000000
1987	2058000000
1988	2262000000
1989	2188000000
1990	2685000000
1991	3054000000
1992	3445000000
1993	3991000000
1994	4776000000
1995	5185000000
1996	5416000000
1997	5839000000
1998	5933000000
1999	5870000000
2000	6281000000
2001	5973000000
2002	6105000000
2003	6672000000
2004	7973000000
2005	8834000000
2006	10258000000
2007	11301000000
2008	13953000000
2009	10049000000
2010	13512000000
2011	20269000000
2012	19190000000
2013	18003000000
2014	19417000000
2015	18935000000
2016	19183000000
2017	20980000000
2018	22233000000
2019	19937000000
2020	16055000000
2021	20637000000
2022	18291000000
2023	16811000000