Year	current US$
1960	33000000
1961	32000000
1962	43000000
1963	41000000
1964	40000000
1965	37000000
1966	36000000
1967	34000000
1968	36000000
1969	37000000
1970	40000000
1971	47000000
1972	44000000
1973	53000000
1974	72000000
1975	80000000
1976	124000000
1977	149000000
1978	155000000
1979	185000000
1980	226000000
1981	152000000
1982	178000000
1983	166000000
1984	179000000
1985	168000000
1986	184000000
1987	214000000
1988	179000000
1989	144000000
1990	160000000
1991	166000000
1992	73000000
1993	80000000
1994	82000000
1995	110000000
1996	90000000
1997	212000000
1998	320000000
1999	334000000
2000	318000000
2001	274000000
2002	280000000
2003	347000000
2004	391000000
2005	470000000
2006	509000000
2007	522000000
2008	480000000
2009	576000000
2010	579000000
2011	767000000
2012	815000000
2013	885000000
2014	950000000
2015	882000000
2016	986000000
2017	980000000
2018	1078000000
2019	1202000000
2020	885000000
2021	1130000000
2022	1282000000
2023	896000000