Year	current US$
1960	14000000
1961	14000000
1962	14000000
1963	22000000
1964	29000000
1965	26000000
1966	31000000
1967	29000000
1968	36000000
1969	36000000
1970	30000000
1971	32000000
1972	39000000
1973	37000000
1974	48000000
1975	47000000
1976	61000000
1977	82000000
1978	72000000
1979	80000000
1980	116000000
1981	79000000
1982	107000000
1983	80000000
1984	86000000
1985	92000000
1986	66000000
1987	130000000
1988	130000000
1989	134000000
1990	120000000
1991	126000000
1992	107000000
1993	110000000
1994	151000000
1995	171000000
1996	147000000
1997	163000000
1998	151000000
1999	146000000
2000	161000000
2001	142000000
2002	147000000
2003	128000000
2004	134000000
2005	128000000
2006	158000000
2007	178000000
2008	150000000
2009	120000000
2010	140000000
2011	190000000
2012	203000000
2013	116000000
2014	99000000
2015	86000000
2016	115000000
2017	140000000
2018	164000000
2019	148000000
2020	134000000
2021	150000000
2022	143000000
2023	137000000