Year	constant 2015 US$
1970	26556.699362059666
1971	26604.191242884273
1972	27170.613145328953
1973	28170.052926019045
1974	28362.06225189583
1975	29532.009105892663
1976	29735.35371803427
1977	28759.545893595485
1978	28892.346492204164
1979	29779.189463972143
1980	30102.62293641257
1981	29683.20930977036
1982	29607.440023139727
1983	29998.761744047937
1984	31523.119572717314
1985	32179.810196605013
1986	33628.99380854244
1987	34646.5793598693
1988	35428.50216260485
1989	36099.15068078152
1990	35685.60486235693
1991	34879.841413719485
1992	33791.348576549375
1993	32287.55709907367
1994	33944.74264445663
1995	35605.41433327198
1996	35936.192558325274
1997	36909.53704146326
1998	38585.20853665625
1999	40516.28562976117
2000	42210.22580250903
2001	42484.84726083033
2002	42929.01464019165
2003	44188.99439983291
2004	45197.06617995541
2005	46376.45418132962
2006	48936.72404652197
2007	50738.858679172874
2008	50292.661397729826
2009	47366.59322671832
2010	49820.02308098605
2011	50481.11268081279
2012	49880.68457315926
2013	49990.51290009789
2014	50767.82872634178
2015	51981.67241512742
2016	52305.95642450156
2017	53348.015291017255
2018	53588.35415765405
2019	54772.72345944114
2020	53602.993054898405
2021	57011.018859480544
2022	57925.90782612944