Year	constant 2015 US$
1960	23733964092.152565
1961	23733964092.152565
1962	8184125671.515212
1963	13503806429.965796
1964	13913013269.135553
1965	13913013269.135553
1966	15106623025.239143
1967	15554227057.668198
1968	17643044919.293686
1969	19246956990.943947
1970	19992964209.84592
1971	14808221370.657656
1972	20515167170.358963
1973	21634176507.15092
1974	20328666094.08179
1975	20440566747.04761
1976	21149272244.400837
1977	21037371626.76594
1978	22305581810.180607
1979	23909495369.72551
1980	20813570356.165237
1981	20876010843.103004
1982	23005363319.86808
1983	24431696807.67971
1984	25824303656.620174
1985	26495734919.143806
1986	26416248528.707973
1987	28001221740.324303
1988	28113226237.931843
1989	30362284942.576767
1990	31394602700.143494
1991	31112053707.61057
1992	32325421219.056446
1993	31711240435.8897
1994	30633057516.227524
1995	32562939262.383423
1996	35005160316.635666
1997	37210486692.72395
1998	37843062450.463135
1999	40115566776.46961
2000	37972728166.63561
2001	40402982769.47093
2002	42705952787.330765
2003	45908899246.38057
2004	47377984022.264725
2005	50173285079.57836
2006	49270165948.14593
2007	49171625616.249664
2008	48139021478.30846
2009	43517675416.3908
2010	43256569363.8925
2011	42088641991.067406
2012	40531362237.39792
2013	38221074589.8662
2014	38297516739.04595
2015	38489004322.74114
2016	41144745621.010315
2017	39375521559.306854
2018	38036753826.29039
2019	35868658858.191864
2020	31492682477.49246
2021	35114340962.40409
2022	35184569644.328896
2023	36275291303.303055