Year	current US$
1960	480000000
1961	300000000
1962	341000000
1963	459000000
1964	318000000
1965	306000000
1966	424000000
1967	446000000
1968	570000000
1969	680000000
1970	781000000
1971	687000000
1972	738000000
1973	1013000000
1974	1381000000
1975	865000000
1976	944000000
1977	989000000
1978	931000000
1979	1514000000
1980	2269000000
1981	1678000000
1982	1601000000
1983	1686000000
1984	1928000000
1985	1853000000
1986	1844000000
1987	1813000000
1988	2460000000
1989	2417000000
1990	2326000000
1991	1649000000
1992	1246000000
1993	1144000000
1994	1256000000
1995	1563000000
1996	1547000000
1997	1449000000
1998	1422000000
1999	809000000
2000	807000000
2001	880000000
2002	1132000000
2003	1378000000
2004	1917000000
2005	2403000000
2006	2705000000
2007	3100000000
2008	4400000000
2009	3500000000
2010	5300000000
2011	6600000000
2012	6300000000
2013	6200000000
2014	7915000000
2015	8685000000
2016	7193000000
2017	12296000000
2018	20004000000
2019	13382000000
2020	14230000000
2021	21412000000
2022	15672000000
2023	16400000000