Year	constant 2015 US$
1960	1499.155404165675
1961	1564.3123364921587
1962	1576.812582371439
1963	1610.5938394371676
1964	1637.137811559953
1965	1695.6897523249079
1966	1687.8744109730353
1967	1798.962448731218
1968	1837.1032226172701
1969	1879.9902959544927
1970	1940.1841444854474
1971	2001.9325373906647
1972	2085.812079077013
1973	2184.7177063426084
1974	2309.7791970407043
1975	2407.522054017214
1976	2525.4868854024326
1977	2746.859608449943
1978	3001.5705191657003
1979	3273.6139492190164
1980	3562.6006259549476
1981	3785.5527980450815
1982	3631.1937896433024
1983	3424.251146336735
1984	3423.803622388761
1985	3479.869123214514
1986	3551.650619997952
1987	3715.6680354222376
1988	3827.5813246405164
1989	3982.347846291399
1990	4036.322089817106
1991	4068.2922244823567
1992	4031.816002877699
1993	4125.5561047711335
1994	4239.499740127494
1995	4421.910046213814
1996	4388.797501662907
1997	4473.74334996442
1998	4381.167439047653
1999	4233.11850733589
2000	4056.2387696082556
2001	3954.7013197656925
2002	3897.7830005971437
2003	4015.5007492207246
2004	4129.771024501736
2005	4171.245169631258
2006	4326.108777238945
2007	4515.3995327897555
2008	4761.8796116016565
2009	4701.616760295041
2010	5163.476069111145
2011	5315.393912367439
2012	5207.027323758674
2013	5561.548479436361
2014	5774.583478561792
2015	5861.40189546648
2016	6025.096768904522
2017	6226.685419833297
2018	6338.513678207746
2019	6229.224895366425
2020	6095.391375306987
2021	6259.738739398722
2022	6199.600382310346
2023	6415.429284665615