Year	current US$
1960	33000000
1961	36000000
1962	46000000
1963	34000000
1964	37000000
1965	43000000
1966	36000000
1967	34000000
1968	34000000
1969	39000000
1970	47000000
1971	63000000
1972	70000000
1973	110000000
1974	180000000
1975	176000000
1976	155000000
1977	159000000
1978	286000000
1979	361000000
1980	439000000
1981	365000000
1982	332000000
1983	353000000
1984	279000000
1985	299000000
1986	444000000
1987	374000000
1988	504000000
1989	502000000
1990	602000000
1991	671000000
1992	608000000
1993	634000000
1994	589000000
1995	772000000
1996	772000000
1997	739000000
1998	761000000
1999	824000000
2000	806000000
2001	990000000
2002	928000000
2003	1271000000
2004	1364000000
2005	1544000000
2006	1820000000
2007	2185000000
2008	3339000000
2009	2486000000
2010	3428000000
2011	3352000000
2012	3524000000
2013	3807000000
2014	3909000000
2015	3800000000
2016	4051000000
2017	4286000000
2018	4722000000
2019	5134000000
2020	5107000000
2021	6296000000
2022	6456000000
2023	8364000000