Year	current US$
1960	7000000
1961	8000000
1962	10000000
1963	10000000
1964	12000000
1965	13000000
1966	17000000
1967	17000000
1968	15000000
1969	21000000
1970	27000000
1971	35000000
1972	36000000
1973	38000000
1974	44000000
1975	46000000
1976	48000000
1977	59000000
1978	83000000
1979	101000000
1980	124000000
1981	129000000
1982	118000000
1983	144000000
1984	119000000
1985	125000000
1986	155000000
1987	179000000
1988	220000000
1989	274000000
1990	271000000
1991	295000000
1992	313000000
1993	300000000
1994	303000000
1995	307000000
1996	313000000
1997	332000000
1998	328000000
1999	355000000
2000	355000000
2001	355000000
2002	309000000
2003	403000000
2004	422000000
2005	486000000
2006	592000000
2007	614000000
2008	656000000
2009	520000000
2010	662000000
2011	697000000
2012	644000000
2013	620000000
2014	627000000
2015	570000000
2016	655000000
2017	655000000
2018	659000000
2019	598000000
2020	504000000
2021	602000000
2022	834000000
2023	936000000