Year	current US$
1960	47000000
1961	55000000
1962	59000000
1963	73000000
1964	95000000
1965	105000000
1966	101000000
1967	120000000
1968	125000000
1969	142000000
1970	144000000
1971	179000000
1972	228000000
1973	331000000
1974	768000000
1975	943000000
1976	1135000000
1977	1343000000
1978	1107000000
1979	1848000000
1980	2173000000
1981	2201000000
1982	2161000000
1983	2000000000
1984	2011000000
1985	1951000000
1986	1271000000
1987	1286000000
1988	1196000000
1989	1598000000
1990	2204000000
1991	2243000000
1992	2082000000
1993	2295000000
1994	2350000000
1995	2713000000
1996	3184000000
1997	3024000000
1998	1916000000
1999	2394000000
2000	2598000000
2001	2524000000
2002	2409000000
2003	3062000000
2004	3728000000
2005	5065000000
2006	5450000000
2007	6309000000
2008	9566000000
2009	5356000000
2010	8686000000
2011	9766000000
2012	12129000000
2013	13039000000
2014	13914000000
2015	10654000000
2016	9503000000
2017	5771000000
2018	8584000000
2019	7714000000
2020	7345000000
2021	8031000000
2022	9076000000
2023	7700000000