Year	constant 2015 US$
1970	9167.465295674581
1971	9469.491764319468
1972	9727.538070713365
1973	10221.617593202378
1974	10474.463782664148
1975	10444.317706489988
1976	10858.191899231524
1977	11134.521767487458
1978	11385.931879628177
1979	12120.48304276997
1980	12820.246000456307
1981	13010.78888409551
1982	13128.22832104386
1983	13099.932359243188
1984	13483.53377315866
1985	13866.099437799896
1986	14428.848826028281
1987	14952.669236378564
1988	15556.457099695821
1989	16161.842275791487
1990	16478.49876354821
1991	16908.17766434701
1992	17188.210086867235
1993	16655.496333515952
1994	16907.090784404667
1995	17164.998492043946
1996	17340.172429606166
1997	17935.53597635637
1998	18533.889176333694
1999	19040.638911007634
2000	19538.221509680472
2001	19653.03876579994
2002	19615.512313532643
2003	19660.321458998613
2004	19723.280607744633
2005	19898.75204023158
2006	20105.493711021758
2007	20241.70013727403
2008	19880.40349992925
2009	19492.82230259368
2010	19637.05895227746
2011	19616.014913311214
2012	18836.480323073665
2013	18164.298562829725
2014	18029.837716761314
2015	18377.877245542084
2016	18638.675226851574
2017	18953.841703634724
2018	19167.21338584251
2019	19429.613893742084
2020	17491.700579202443
2021	18543.5624983085
2022	19515.991482554204
2023	19798.943399138854