Year	current US$
1960	38000000
1961	37000000
1962	39000000
1963	43000000
1964	50000000
1965	59000000
1966	57000000
1967	66000000
1968	83000000
1969	100000000
1970	104000000
1971	120000000
1972	222000000
1973	515000000
1974	654000000
1975	441000000
1976	551000000
1977	683000000
1978	714000000
1979	964000000
1980	1031000000
1981	838000000
1982	771000000
1983	813000000
1984	892000000
1985	912000000
1986	1033000000
1987	1161000000
1988	1399000000
1989	1404000000
1990	1177000000
1991	1460000000
1992	1927000000
1993	2585000000
1994	2632000000
1995	2654000000
1996	2529000000
1997	2163000000
1998	1772000000
1999	1875000000
2000	2096000000
2001	1805000000
2002	1641000000
2003	2207000000
2004	2552000000
2005	3273000000
2006	4166000000
2007	4681000000
2008	5713000000
2009	4394000000
2010	5742000000
2011	6908000000
2012	6328000000
2013	5951000000
2014	8794000000
2015	8453000000
2016	8194000000
2017	9952000000
2018	10524000000
2019	10946000000
2020	9077000000
2021	11269000000
2022	14327000000
2023	12036000000