Year	constant 2015 US$
1968	28494720063.949253
1969	31828602246.0635
1970	32337859476.376854
1971	35151253489.04754
1972	38982739801.71919
1973	44011514367.36295
1974	47224354860.79722
1975	51332872773.45056
1976	55952831575.79585
1977	59645718311.58974
1978	61554381228.9166
1979	57799564184.56498
1980	55533821241.82127
1981	60776214076.38038
1982	64678047700.59569
1983	69503028982.44133
1984	75932059796.7141
1985	80260187039.75716
1986	88687506595.4668
1987	97609469385.01695
1988	99144930608.50768
1989	102139625604.94148
1990	112027544169.232
1991	108816144578.35738
1992	105988954942.02458
1993	102588777571.26138
1994	85892947491.4475
1995	91215749529.24876
1996	95753999637.78952
1997	104782624054.47444
1998	106267536562.37488
1999	101819021309.9894
2000	109205255374.81367
2001	106750363314.01253
2002	112906102282.90334
2003	124422600484.46872
2004	139972871156.46643
2005	150752365614.05585
2006	164213468352.0208
2007	175989149013.9054
2008	176997022333.1142
2009	160098391859.21436
2010	174005710016.44952
2011	199444132145.9496
2012	203779473862.42126
2013	216864207286.1113
2014	224289009420.75812
2015	231045000987.18478
2016	239351933578.23325
2017	258590223349.6614
2018	263935704382.53854
2019	263167462989.12662
2020	269762302118.83762
2021	308967557804.9236
2022	315116195333.3756
2023	323980428971.9407