Year	current US$
1960	157000000
1961	193000000
1962	193000000
1963	230000000
1964	296000000
1965	277000000
1966	311000000
1967	325000000
1968	425000000
1969	452000000
1970	469000000
1971	457000000
1972	553000000
1973	857000000
1974	1213000000
1975	1181000000
1976	1632000000
1977	2157000000
1978	2322000000
1979	2514000000
1980	3134000000
1981	2533000000
1982	2350000000
1983	2090000000
1984	2706000000
1985	3197000000
1986	3354000000
1987	3109000000
1988	2769000000
1989	2807000000
1990	3072000000
1991	2686000000
1992	2875000000
1993	2519000000
1994	2742000000
1995	3806000000
1996	4446000000
1997	4451000000
1998	4606000000
1999	4661000000
2000	3888000000
2001	3946000000
2002	5275000000
2003	5788000000
2004	6919000000
2005	7697000000
2006	8477000000
2007	8669000000
2008	10390000000
2009	11327000000
2010	11410000000
2011	12635000000
2012	12124000000
2013	12049000000
2014	12951000000
2015	11730000000
2016	10876000000
2017	11853000000
2018	11912000000
2019	12718000000
2020	12454000000
2021	15334000000
2022	16429000000
2023	20263000000