Year	constant 2015 US$
1968	38164229550.438705
1969	42089210317.39284
1970	41632737184.98704
1971	44351868818.206764
1972	46846233523.62268
1973	51111371987.41851
1974	54882338343.02812
1975	53388952203.34095
1976	51988973462.81472
1977	50906920027.98882
1978	50162822473.79189
1979	51594776203.98659
1980	54859478151.03003
1981	58340843473.6881
1982	56558294675.110886
1983	56655612323.425575
1984	60232539791.965
1985	60796392114.26765
1986	62216330219.25573
1987	64104199322.84435
1988	66440580796.534744
1989	66740296817.33595
1990	63593749955.81916
1991	58348903719.93127
1992	53534122966.48749
1993	52332779592.780365
1994	53359504454.39274
1995	56723736932.90169
1996	58015450427.41876
1997	57779148170.63371
1998	57167507811.94957
1999	58676755473.43616
2000	60939434834.2969
2001	61788136171.94237
2002	63395030146.46605
2003	63363311093.470215
2004	66497707561.62858
2005	70078889358.0529
2006	74136669974.86182
2007	78095756398.00844
2008	80025045721.2202
2009	75719380186.47546
2010	80519736084.52107
2011	84103376055.01273
2012	86394911609.5779
2013	88958510122.25983
2014	89595424495.6756
2015	92818944732.66054
2016	96047656907.13087
2017	97958391931.36043
2018	100247103502.5498
2019	101527566037.60524
2020	94713658920.43915
2021	100097698855.4045
2022	101908417872.25175
2023	103832600981.22144