Year	constant 2015 US$
1960	3304.6916315898147
1961	3748.9522430310903
1962	3978.9925922301904
1963	4167.211049362599
1964	4298.58635284815
1965	4591.270720768855
1966	4727.335596430495
1967	4846.1134643497535
1968	4888.233758023905
1969	5183.7835156450365
1970	5515.177414159987
1971	5956.281974638565
1972	6497.312188901483
1973	7012.414309780412
1974	9575.903292403646
1975	11165.451810742019
1976	14801.341149930924
1977	12636.07076052513
1978	9365.343731276866
1979	9177.128344877765
1980	9174.080737878565
1981	9392.925877419633
1982	8863.576885936101
1983	9112.391764285916
1984	9534.277455090178
1985	9061.080192308733
1986	8744.67553556087
1987	7047.760491306804
1988	7735.555379338548
1989	8167.950119269767
1990	8360.263030744472
1991	8634.419933619645
1992	8146.195542997896
1993	8245.591508350728
1994	8331.04983207138
1995	8524.419155528654
1996	8613.580568324007
1997	8882.402878780373
1998	8963.204979074131
1999	7959.064795781586
2000	7611.835714177269
2001	7574.114914528978
2002	7357.56671357805
2003	7322.606140926367
2004	7171.68353286183
2005	7155.365484792998
2006	6750.050848792338
2007	6937.485134421072
2008	6497.481238974947
2009	6295.1990548562935
2010	6514.731162982202
2011	6735.082879198223
2012	6840.9486124671375
2013	6977.7702694523905
2014	7039.68214859312
2015	7090.454633949424
2016	7038.577278230833
2017	6893.384326888999
2018	6786.890349912376
2019	6893.323105480876
2020	6619.688602959772
2021	6577.411771520788
2022	6637.06610644966
2023	6654.75657105081