Year	current US$
1960	13000000
1961	16000000
1962	22000000
1963	19000000
1964	22000000
1965	24000000
1966	27000000
1967	26000000
1968	27000000
1969	30000000
1970	33000000
1971	36000000
1972	43000000
1973	44000000
1974	64000000
1975	88000000
1976	73000000
1977	90000000
1978	106000000
1979	132000000
1980	150000000
1981	162000000
1982	128000000
1983	112000000
1984	130000000
1985	128000000
1986	122000000
1987	143000000
1988	181000000
1989	216000000
1990	211000000
1991	256000000
1992	274000000
1993	281000000
1994	260000000
1995	257000000
1996	255000000
1997	286000000
1998	295000000
1999	370000000
2000	524000000
2001	517000000
2002	525000000
2003	552000000
2004	520000000
2005	593000000
2006	660000000
2007	684000000
2008	837000000
2009	669000000
2010	706000000
2011	831000000
2012	861000000
2013	928000000
2014	962000000
2015	991000000
2016	953000000
2017	916000000
2018	958000000
2019	986000000
2020	787000000
2021	1061000000
2022	1381000000
2023	1341000000