Year	current US$
1960	190000000
1961	198000000
1962	212000000
1963	206000000
1964	176000000
1965	165000000
1966	187000000
1967	211000000
1968	211000000
1969	226000000
1970	218000000
1971	269000000
1972	347000000
1973	481000000
1974	1272000000
1975	1107000000
1976	1516000000
1977	1845000000
1978	1893000000
1979	2492000000
1980	3606000000
1981	4347000000
1982	3789000000
1983	3119000000
1984	3204000000
1985	2897000000
1986	2199000000
1987	2430000000
1988	2411000000
1989	2831000000
1990	3761000000
1991	3511000000
1992	3464000000
1993	3723000000
1994	3622000000
1995	4113000000
1996	4700000000
1997	4384000000
1998	3270000000
1999	4363000000
2000	6194000000
2001	5577000000
2002	5794000000
2003	6632000000
2004	7558000000
2005	10242000000
2006	12200000000
2007	13634000000
2008	17316000000
2009	11874000000
2010	14971000000
2011	19650000000
2012	19768000000
2013	21930000000
2014	20130000000
2015	16540000000
2016	12785000000
2017	15376000000
2018	18044000000
2019	18120000000
2020	14066000000
2021	22369000000
2022	30194000000
2023	25235000000