Year	constant 2015 US$
1970	16879.135073552803
1971	17206.429124037528
1972	18120.092364667213
1973	19215.416469857984
1974	19656.47752502114
1975	19861.864109874186
1976	20694.47929980326
1977	20876.3323679572
1978	21235.132791674936
1979	21251.08482107099
1980	21315.80328220038
1981	21725.80979647789
1982	20861.43591137097
1983	21352.63113297582
1984	22325.320482151867
1985	23177.50090359881
1986	23420.411641332947
1987	24312.422951406865
1988	25116.05522800778
1989	25281.85712462283
1990	24683.106621380568
1991	23948.91144890805
1992	23610.939929780106
1993	23934.724621625875
1994	24701.47177845524
1995	25432.74320660871
1996	25550.845902841676
1997	26375.467205302266
1998	26687.4721366893
1999	28058.48075337138
2000	29696.55812708145
2001	29698.45523737276
2002	30257.833950486354
2003	30934.75799892914
2004	32366.157669120545
2005	33274.552410495824
2006	34526.72085053034
2007	35215.60333171211
2008	35292.49475293731
2009	32740.559886681636
2010	34176.044475639676
2011	35381.04262893821
2012	35493.0228772567
2013	36062.11816224627
2014	36484.80748523453
2015	35364.11910717832
2016	35186.78510833964
2017	36548.00610356281
2018	36866.81876072106
2019	37016.755421119204
2020	33909.82006105011
2021	36717.21608560779