Year	current US$
1960	120000000
1961	117000000
1962	128000000
1963	143000000
1964	150000000
1965	157000000
1966	191000000
1967	154000000
1968	159000000
1969	190000000
1970	184000000
1971	215000000
1972	274000000
1973	330000000
1974	488000000
1975	732000000
1976	1006000000
1977	1381000000
1978	1504000000
1979	1963000000
1980	2402000000
1981	3165000000
1982	3240000000
1983	3036000000
1984	2784000000
1985	2733000000
1986	2432000000
1987	2710000000
1988	2732000000
1989	2126000000
1990	2600000000
1991	2508000000
1992	3255000000
1993	3539000000
1994	3381000000
1995	3697000000
1996	4293000000
1997	4102000000
1998	3828000000
1999	3717000000
2000	4597000000
2001	4871000000
2002	5076000000
2003	5743000000
2004	8179000000
2005	10498000000
2006	11548000000
2007	13681000000
2008	16995000000
2009	14236000000
2010	15564000000
2011	18930000000
2012	20752000000
2013	21549000000
2014	22930000000
2015	20475000000
2016	19324000000
2017	20498000000
2018	20310000000
2019	19170000000
2020	17233000000
2021	21542000000
2022	27364000000
2023	25470000000