Year	constant 2015 US$
1960	396.3960229361492
1961	412.2657437191861
1962	429.8923399520983
1963	444.8858836627164
1964	464.09616849978966
1965	483.5950414470304
1966	510.8032936665576
1967	537.4498274181159
1968	590.2322573572474
1969	674.7681384883584
1970	782.9417104985662
1971	965.7100035469535
1972	1176.5457165851653
1973	1360.6428375081655
1974	1406.8787452790848
1975	1449.4962906738738
1976	1523.2765363447857
1977	1620.526891692598
1978	1760.2494293386214
1979	1876.6472977173792
1980	2000.66360841295
1981	2083.9512350123987
1982	2245.4802747721856
1983	2450.3672144973734
1984	2566.712311498681
1985	2654.1358536068437
1986	2772.31064752819
1987	2997.2584111584856
1988	3464.0950215241405
1989	3794.932194939965
1990	3931.730225920752
1991	4105.298633187693
1992	4105.765611546657
1993	4065.48756598901
1994	4097.306515862255
1995	4271.47088591569
1996	4410.388944254587
1997	4667.885911085301
1998	4585.674131246522
1999	4922.3738968436
2000	4917.232088886536
2001	4831.783762068221
2002	5030.265216080499
2003	5171.541252917681
2004	5219.414504467586
2005	5360.01917590494
2006	5700.219856000277
2007	5913.069930717364
2008	5982.661964304737
2009	5031.983613616966
2010	5428.29615842458
2011	5684.3578917552395
2012	5566.68178544504
2013	6067.998436830771
2014	6291.271811411715
2015	5869.737578906277
2016	6166.239927102981
2017	6287.834749367233
2018	6418.706354222587
2019	6485.56819794359
2020	5810.898476067424
2021	6398.01384782456
2022	6641.569807405485
2023	6708.039461241436