Year	current US$
1960	146000000
1961	126000000
1962	144000000
1963	120000000
1964	144000000
1965	164000000
1966	155000000
1967	190000000
1968	226000000
1969	193000000
1970	190000000
1971	199000000
1972	326000000
1973	532000000
1974	1124000000
1975	974000000
1976	1258000000
1977	1436000000
1978	1558000000
1979	2104000000
1980	2481000000
1981	2451000000
1982	2327000000
1983	2348000000
1984	2620000000
1985	2905000000
1986	2172000000
1987	1928000000
1988	2192000000
1989	2354000000
1990	2714000000
1991	2852000000
1992	3007000000
1993	2904000000
1994	3820000000
1995	4307000000
1996	4900000000
1997	5264000000
1998	4203000000
1999	4451000000
2000	4927000000
2001	4678000000
2002	5042000000
2003	6223000000
2004	7753000000
2005	10100000000
2006	12728000000
2007	14321000000
2008	18818000000
2009	13863000000
2010	17490000000
2011	22322000000
2012	23765000000
2013	24848000000
2014	25724000000
2015	18331000000
2016	16798000000
2017	19122000000
2018	21628000000
2019	22329000000
2020	20355000000
2021	26699000000
2022	32658000000
2023	31126000000