Year	constant 2015 US$
1970	25145.309917882365
1971	25541.106679112
1972	26643.380591204113
1973	27964.115563824354
1974	27436.247197866975
1975	27045.007255864133
1976	28172.74761310447
1977	29083.070984026737
1978	30244.169445617605
1979	30657.949576512165
1980	30036.531335434174
1981	30584.302976712952
1982	30059.43291301123
1983	30847.44113991964
1984	32947.87834920973
1985	33915.3826019323
1986	34447.251173796794
1987	35511.73928415421
1988	36973.45071692498
1989	37506.85268081249
1990	37541.16519377066
1991	37024.08699734201
1992	37594.87034022105
1993	37977.46870637392
1994	39126.73965388628
1995	40001.44171611423
1996	41225.5358996805
1997	42834.497107846066
1998	44625.523667104666
1999	46143.73160422384
2000	47794.052571652144
2001	48047.68122781995
2002	48299.340524730665
2003	48980.732883506054
2004	50410.237455379036
2005	51630.59152066778
2006	52934.160900531526
2007	52901.96404452399
2008	51677.458462314404
2009	50253.21955692804
2010	51669.05697507325
2011	52400.02078970891
2012	53545.84244549692
2013	54044.98327164028
2014	55364.48832555633
2015	56513.890511258534
2016	56822.18852253097
2017	58017.40364632515
2018	59359.43235834404
2019	60601.578383014545
2020	58354.21218035891
2021	61982.56836967931
2022	63206.90757838271