Year	constant 2015 US$
1970	15984.408815153522
1971	16641.185159266603
1972	17605.196938018085
1973	18555.779892731443
1974	18902.862568603025
1975	18958.68176132628
1976	19841.844419088142
1977	20757.04168070027
1978	20856.332335355997
1979	21940.552018838178
1980	22114.689930715893
1981	21881.209701316944
1982	22288.18542333763
1983	23134.078438507902
1984	23172.95713632128
1985	23667.766712108336
1986	24300.46391680138
1987	24743.69269107334
1988	25674.741485048417
1989	26538.273679010945
1990	27517.0923033083
1991	28044.498562407218
1992	28293.656331680744
1993	28041.966834663897
1994	28608.712368680615
1995	29179.749483054216
1996	29779.915805805384
1997	30168.918277014465
1998	31148.822855153794
1999	31684.121492828246
2000	32774.924613453615
2001	32725.794746373886
2002	33420.536109683315
2003	33563.10037618165
2004	34356.97711379986
2005	34750.639055476335
2006	36007.33783419495
2007	37111.24200160369
2008	37570.54860756386
2009	35576.914735992876
2010	36170.26775427931
2011	36601.78108869766
2012	36289.037813240975
2013	35989.48865808493
2014	36022.51560895799
2015	35811.6857751508
2016	36759.35375188633
2017	36633.63456724209
2018	37218.91789942956
2019	37611.485331974225
2020	34985.108141949655
2021	36098.250885241294