Year	current US$
1960	13000000
1961	21000000
1962	17000000
1963	23000000
1964	27000000
1965	27000000
1966	24000000
1967	31000000
1968	31000000
1969	31000000
1970	30000000
1971	28000000
1972	36000000
1973	38000000
1974	37000000
1975	48000000
1976	63000000
1977	107000000
1978	99000000
1979	88000000
1980	71000000
1981	83000000
1982	58000000
1983	105000000
1984	131000000
1985	62000000
1986	99000000
1987	109000000
1988	144000000
1989	155000000
1990	188000000
1991	194000000
1992	182000000
1993	131000000
1994	148000000
1995	243000000
1996	238000000
1997	237000000
1998	262000000
1999	243000000
2000	183000000
2001	189000000
2002	185000000
2003	601000000
2004	2191000000
2005	3081000000
2006	3352000000
2007	3666000000
2008	4169000000
2009	2800000000
2010	3600000000
2011	4800000000
2012	4800000000
2013	3800000000
2014	4194000000
2015	2426000000
2016	2090000000
2017	2621000000
2018	2670000000
2019	2588000000
2020	1808000000
2021	2711000000
2022	4383000000
2023	3700000000