Year	current US$
1960	9000000
1961	13000000
1962	13000000
1963	12000000
1964	12000000
1965	16000000
1966	18000000
1967	19000000
1968	21000000
1969	20000000
1970	18000000
1971	21000000
1972	25000000
1973	31000000
1974	47000000
1975	60000000
1976	74000000
1977	78000000
1978	100000000
1979	141000000
1980	165000000
1981	126000000
1982	103000000
1983	115000000
1984	100000000
1985	93000000
1986	104000000
1987	127000000
1988	138000000
1989	161000000
1990	188000000
1991	204000000
1992	218000000
1993	261000000
1994	212000000
1995	182000000
1996	258000000
1997	278000000
1998	228000000
1999	192000000
2000	187000000
2001	134000000
2002	161000000
2003	156000000
2004	229000000
2005	260000000
2006	259000000
2007	321000000
2008	322000000
2009	304000000
2010	285000000
2011	341000000
2012	380000000
2013	350000000
2014	387000000
2015	420000000
2016	336000000
2017	548000000
2018	677000000
2019	621000000
2020	582000000
2021	607000000
2022	694000000
2023	784000000