Year	constant 2015 US$
1970	14791.600134426852
1971	15116.378006887342
1972	15782.210182791703
1973	16533.18626209548
1974	16022.938696979116
1975	15948.935892666022
1976	16579.79223882554
1977	17014.39388301927
1978	17705.38220822055
1979	17837.494880667866
1980	17547.619232892797
1981	17736.581122621144
1982	17852.16258072846
1983	18251.894887086444
1984	19106.588788564823
1985	19741.676466459736
1986	20506.187843626205
1987	21144.62884458819
1988	22182.94124899431
1989	22723.632450837675
1990	23146.523725885792
1991	23276.35941815137
1992	23591.414333587465
1993	23637.53645378376
1994	24382.05449933246
1995	25025.277462387363
1996	25670.66431679827
1997	26500.45390173847
1998	27310.40584745957
1999	28039.213483630545
2000	28866.076153046022
2001	29203.23359095415
2002	29448.613212089564
2003	29840.0116875942
2004	30680.23364978485
2005	31236.572659837846
2006	32020.178024517834
2007	32319.142798216057
2008	31422.55464758576
2009	30417.773126260698
2010	31464.258843852658
2011	31814.97649273492
2012	32225.727296935635
2013	32512.495757643017
2014	33172.1767441259
2015	34030.46913769712
2016	34435.30722214708
2017	35198.10834660426
2018	35758.852815824815
2019	36207.58520782506
2020	34294.56572891057
2021	35963.57875144771