Year	constant 2015 US$
1964	16633038880.32745
1965	18740886167.59613
1966	19950808978.29446
1967	20689904184.427063
1968	22423617313.392174
1969	24561290608.84613
1970	27539015742.966125
1971	29306662230.422836
1972	32155183065.72976
1973	33590623095.381737
1974	31372786658.65517
1975	31824815250.14297
1976	52308260334.54327
1977	33415809205.355026
1978	35150126104.21354
1979	35801113492.776
1980	36394859086.34149
1981	35851281646.47766
1982	33584917813.999134
1983	34844413286.1239
1984	38144698081.055305
1985	39346991699.89
1986	40421159529.6223
1987	44336864168.385086
1988	47422606047.42874
1989	49324027619.87164
1990	50554257492.57974
1991	49431680260.34773
1992	51230811515.560585
1993	53764691747.32642
1994	56082674751.243484
1995	53349108833.93148
1996	62889882915.48938
1997	67393323033.34143
1998	69226935965.69182
1999	76388873799.36195
2000	77281224005.26222
2001	78253741424.46262
2002	78938174948.49084
2003	81137227943.15218
2004	86974801746.06566
2005	88363639802.99481
2006	88860369700.0211
2007	88918524817.38927
2008	86399456231.9246
2009	83145536294.91203
2010	82613004637.94899
2011	84220865677.66309
2012	86550142281.5846
2013	86170222172.31212
2014	84286541997.62665
2015	79629600000
2016	75639330359.57341
2017	77135066475.0205
2018	77858897902.83076
2019	85723751361.95148
2020	70402248192.93402
2021	92938458495.9278
2022	100899129043.23088
2023	98499519933.25081