Year	current US$
1960	32000000
1961	40000000
1962	37000000
1963	40000000
1964	50000000
1965	70000000
1966	70000000
1967	90000000
1968	43000000
1969	53000000
1970	64000000
1971	109000000
1972	141000000
1973	195000000
1974	271000000
1975	413000000
1976	817000000
1977	1225000000
1978	1185000000
1979	1424000000
1980	1423000000
1981	1518000000
1982	1947000000
1983	1456000000
1984	1162000000
1985	1139000000
1986	1099000000
1987	1161000000
1988	1267000000
1989	1326000000
1990	1695000000
1991	1720000000
1992	2015000000
1993	1891000000
1994	1927000000
1995	3398000000
1996	2868000000
1997	3322000000
1998	3409000000
1999	2500000000
2000	3252000000
2001	3758000000
2002	4052000000
2003	4897000000
2004	6005000000
2005	10061000000
2006	16440000000
2007	23429000000
2008	27900000000
2009	24922000000
2010	23240000000
2011	22328000000
2012	30787000000
2013	27034000000
2014	30448000000
2015	32610000000
2016	32060000000
2017	29896000000
2018	31696000000
2019	29178000000
2020	25835000000
2021	27985000000
2022	33479000000
2023	30928000000