Year	current US$
1960	15000000
1961	19000000
1962	17000000
1963	18000000
1964	30000000
1965	27000000
1966	36000000
1967	32000000
1968	39000000
1969	45000000
1970	55000000
1971	50000000
1972	50000000
1973	61000000
1974	189000000
1975	126000000
1976	105000000
1977	159000000
1978	234000000
1979	218000000
1980	338000000
1981	208000000
1982	178000000
1983	163000000
1984	192000000
1985	190000000
1986	204000000
1987	244000000
1988	242000000
1989	245000000
1990	268000000
1991	253000000
1992	275000000
1993	136000000
1994	328000000
1995	378000000
1996	441000000
1997	424000000
1998	420000000
1999	391000000
2000	363000000
2001	357000000
2002	427000000
2003	598000000
2004	601000000
2005	660000000
2006	630000000
2007	677000000
2008	853000000
2009	903000000
2010	976000000
2011	1179000000
2012	1314000000
2013	1522000000
2014	1324000000
2015	1011000000
2016	1036000000
2017	1016000000
2018	1080000000
2019	1055000000
2020	979000000
2021	1060000000
2022	1348000000
2023	1434000000