Year	constant 2015 US$
1970	43258.89832959067
1971	42166.13299153342
1972	42586.62770996651
1973	42965.936992783
1974	42570.35126253724
1975	40266.23829715691
1976	39247.92162463063
1977	38203.64249794031
1978	36828.836706651935
1979	35152.04361140598
1980	34446.361011466106
1981	33120.94351372854
1982	32134.153039056066
1983	31219.555426199073
1984	30459.131196189403
1985	30008.041862993174
1986	29764.087265259535
1987	30076.358726083967
1988	30323.299530571072
1989	30565.124650857546
1990	30578.06000251644
1991	30301.629920380954
1992	29596.022171719753
1993	28363.338941282265
1994	28144.374397167638
1995	28051.390022867807
1996	28797.853201085898
1997	31149.355653050872
1998	31895.980784360396
1999	32966.23684645695
2000	33901.17697350964
2001	35722.528890156646
2002	35749.92891198909
2003	37250.29518953704
2004	38696.49460697756
2005	39307.140855182166
2006	40994.447608834824
2007	42724.56719944642
2008	41470.4379328172
2009	40442.78510679069
2010	40937.2740669219
2011	41486.19947460482
2012	39174.897286732754
2013	37597.70533132146
2014	38402.64926119037
2015	38885.53032229833
2016	39886.64008441552
2017	39321.614309053744
2018	39320.09244636206
2019	39413.79087778697
2020	34394.41403972426
2021	36616.10076088138
2022	39720.95185888497
2023	40161.769525303316