Year	constant 2015 US$
1970	11395.338116381183
1971	11940.616411117911
1972	12172.283202441708
1973	12518.599782992129
1974	12811.430643581942
1975	13415.052312339834
1976	14147.351674789488
1977	14971.471168253975
1978	14677.236309581633
1979	15241.71164719287
1980	15507.333886456352
1981	15500.769999860962
1982	15617.1380564425
1983	15873.760254593291
1984	16334.232208295496
1985	17787.7519966385
1986	18619.371041061062
1987	18418.04426724212
1988	17932.415313320707
1989	17749.40720938899
1990	17810.92785407708
1991	18095.738969874063
1992	18416.95185287214
1993	18723.383819533898
1994	19249.08431670884
1995	19841.13172317826
1996	20989.066563249355
1997	21527.04416673525
1998	22004.577616197883
1999	22670.497459449405
2000	23463.226103616336
2001	23826.361786044745
2002	24441.37335932938
2003	25074.19401841471
2004	26284.793521853906
2005	27255.781324248903
2006	28378.285677026164
2007	29576.677486229943
2008	29700.359120577334
2009	29337.037268691616
2010	30077.67905709795
2011	30392.093007597952
2012	31046.184574823405
2013	31535.344545319625
2014	31827.582099823518
2015	32366.3960767763
2016	32442.90506860257
2017	32902.394660146165
2018	33154.40673039417
2019	33268.07956187193
2020	31015.34146070762
2021	32422.50579768776
2022	34130.951897221574
2023	33502.871427468366