Year	constant 2015 US$
1960	2579.3867319623664
1961	2698.1748234071524
1962	2902.7421374800815
1963	2943.751349262545
1964	3038.081181514684
1965	3129.385456651725
1966	3277.318419383576
1967	3299.5557907476277
1968	3194.591521390062
1969	3211.1273360634036
1970	3265.0538707759415
1971	3344.9470106762346
1972	3369.37550311712
1973	3473.42712109654
1974	3717.5777753697785
1975	3781.7634122943405
1976	3708.0573873867183
1977	3700.4963683153323
1978	3454.289089123407
1979	3448.9024909277377
1980	3598.3016746325
1981	3725.2125294606485
1982	3627.153425959605
1983	3111.430391849603
1984	3140.405407346121
1985	3153.2887305384693
1986	3334.2048538105064
1987	3604.4565870389292
1988	3083.5308697217633
1989	2713.045011441343
1990	2536.152570512968
1991	2633.006104557956
1992	2555.5027450692537
1993	2626.254865895142
1994	2877.0809357426383
1995	3019.9267352674574
1996	3085.679365388728
1997	3235.539756616092
1998	3197.488507493382
1999	3191.2347394115177
2000	3212.8913660336857
2001	3208.2559032747595
2002	3327.06998099521
2003	3398.0456398018136
2004	3467.8262365176056
2005	3609.5795614377635
2006	3758.1334341245615
2007	4057.8687089929626
2008	4444.514488627366
2009	4491.918360876559
2010	4755.191581271338
2011	4998.2986489571795
2012	5325.989765900902
2013	5660.558223194599
2014	5776.70177707561
2015	5968.503843671726
2016	6074.718788099938
2017	6100.292002731572
2018	6202.92028506044
2019	6310.476468954535
2020	5594.29381927911
2021	5909.8338188676225
2022	6089.46312172941
2023	6110.9363631637025