Year	current US$
1960	725000000
1961	710000000
1962	737000000
1963	735000000
1964	920000000
1965	935000000
1966	1254000000
1967	1362000000
1968	1589000000
1969	1900000000
1970	2388000000
1971	2964000000
1972	3817000000
1973	5198000000
1974	7091000000
1975	7690000000
1976	8730000000
1977	10223000000
1978	13114000000
1979	18208000000
1980	20720000000
1981	20334000000
1982	20498000000
1983	19734000000
1984	23508000000
1985	24247000000
1986	27206000000
1987	34192000000
1988	40341000000
1989	44492000000
1990	55642000000
1991	60177000000
1992	64334000000
1993	64603000000
1994	76696000000
1995	97849000000
1996	107243000000
1997	100756000000
1998	111973000000
1999	104433000000
2000	115251000000
2001	116660000000
2002	125687000000
2003	156147000000
2004	182623000000
2005	192644000000
2006	213717000000
2007	253297000000
2008	281493000000
2009	227338000000
2010	254418000000
2011	306551000000
2012	295250000000
2013	317833000000
2014	324533000000
2015	282274000000
2016	289981000000
2017	319531000000
2018	346754000000
2019	334018000000
2020	308317000000
2021	379969000000
2022	415462000000
2023	423221000000