Year	constant 2015 US$
1975	1445.7055813897027
1976	1519.292877644978
1977	1616.2889047635445
1978	1755.6460413222587
1979	1871.7395070729037
1980	1939.5510400417104
1981	2119.1062062189553
1982	2272.883355463637
1983	2401.2910519366496
1984	2431.932079801383
1985	2496.734228421913
1986	2612.7060919725263
1987	2723.597846976147
1988	3288.3757806597273
1989	3565.100277104381
1990	3848.814181471038
1991	4137.420591086667
1992	4167.425720248126
1993	4245.508160881589
1994	3945.4760678045927
1995	4241.119009954442
1996	4231.195891170536
1997	4558.030288150516
1998	4648.7014573904635
1999	4740.977231179443
2000	4694.037360195176
2001	4737.286098277462
2002	4594.691930890668
2003	4847.838169915315
2004	4843.152413033063
2005	5032.503107067993
2006	5459.001192387549
2007	5748.433440432917
2008	5730.539057166053
2009	4981.887337922832
2010	5233.446125341846
2011	5637.324360165713
2012	5644.047938718251
2013	5809.354969172448
2014	6098.004090003091
2015	5672.8297859502
2016	5623.893950576185
2017	5770.81449472341
2018	5863.4471513674625
2019	6164.772826937617
2020	5800.644983633794
2021	6322.64725863512
2022	6438.340736632044