Year	constant 2015 US$
1970	16245.978294375062
1971	16607.179780415478
1972	17284.038798151458
1973	18103.402776769
1974	17943.43867118052
1975	17761.131304442548
1976	18430.815517448093
1977	18933.779938213036
1978	19633.231170603125
1979	20025.182207837017
1980	19834.27372105654
1981	20040.25737364359
1982	19836.218173807196
1983	20190.192776412794
1984	21184.035378880177
1985	21737.786563445832
1986	22247.870892284103
1987	22911.346002427632
1988	23857.6006775643
1989	24408.101279206196
1990	24816.342424950002
1991	24868.466411929745
1992	25310.713620414637
1993	25526.758501400192
1994	26291.63765730352
1995	26860.345870684137
1996	27559.515686295344
1997	28367.91860658157
1998	29112.194612973995
1999	29894.937489497832
2000	30863.420784423586
2001	31153.480433818382
2002	31356.610448510473
2003	31730.456183677452
2004	32524.438516359398
2005	33152.80356510531
2006	33922.725018906254
2007	34313.3215374692
2008	33745.90605915375
2009	32754.86249773295
2010	33599.70097854757
2011	33965.444874807676
2012	34307.41964645816
2013	34567.700820868995
2014	35203.744799437394
2015	35981.099742634775
2016	36375.769339861006
2017	37101.70461235047
2018	37690.83393471512
2019	38246.740951625456
2020	36437.76933197244
2021	38538.36353310187
2022	39172.62306634395