Year	constant 2015 US$
1960	1758.1091203333801
1961	1822.2627668813043
1962	1882.2861265593633
1963	1895.8256644959451
1964	1962.707493165824
1965	2157.809601987341
1966	2217.870218886488
1967	2301.4012189102455
1968	2406.0010373170308
1969	2407.9814399661855
1970	2583.5457384428664
1971	2714.97773170147
1972	2862.984052031403
1973	2986.7996461503194
1974	3104.418711054507
1975	3045.23625686986
1976	3319.4214278815916
1977	3394.3083262790988
1978	3443.3985016758656
1979	3618.648165809372
1980	4087.6566655404763
1981	3994.3837929159195
1982	3906.768212941391
1983	3718.9950913040107
1984	3751.9220837457633
1985	3771.478772261079
1986	3892.0211642515364
1987	3787.9299469485636
1988	3648.105448520631
1989	3637.2387590048065
1990	3726.441583048037
1991	3804.4734621374428
1992	3803.7161368696816
1993	3815.241856822413
1994	3942.505344944899
1995	3979.382543162594
1996	4073.8807583988905
1997	4223.217906383046
1998	4267.058438256199
1999	4238.9401604218
2000	4366.269443713484
2001	4335.370357219849
2002	4282.759978048483
2003	4312.649407324226
2004	4430.694664605475
2005	4556.059036783187
2006	4766.111634568296
2007	4943.709372685751
2008	5097.194426284864
2009	4994.83344907514
2010	5256.303575791224
2011	5480.973048105829
2012	5592.67424995528
2013	5725.572945652415
2014	5758.604246147575
2015	5748.74079182254
2016	5673.898609655537
2017	5761.067136418125
2018	5813.687998540592
2019	5833.453727341836
2020	5349.929403070649
2021	5734.583588041165
2022	6001.228615955783
2023	6112.083630744732