Year	constant 2015 US$
1970	2554.1050259949675
1971	2725.38176678621
1972	2812.1732371102075
1973	2868.5217543850295
1974	2861.3859840657396
1975	3099.172001328005
1976	3237.8818548383765
1977	3493.7108096031666
1978	3702.3426039987758
1979	3726.0033779502114
1980	3532.100837260488
1981	4210.5019923614045
1982	4557.784807699316
1983	4769.921316379012
1984	5109.662667273332
1985	5138.181912557871
1986	5104.897496395313
1987	4936.582928272625
1988	5085.146369404159
1989	5077.28736694991
1990	4849.401492964722
1991	4307.921517577598
1992	3804.5025574350184
1993	3216.021093175173
1994	3210.7178350966883
1995	3273.0483551594466
1996	3526.541638130801
1997	3615.871836141024
1998	3616.988351844454
1999	3825.7606469026223
2000	4032.0737747323665
2001	4166.054890110226
2002	4203.827282223761
2003	4361.648371498565
2004	4595.852769582937
2005	5113.848242156226
2006	5740.1251033714225
2007	6124.027286184459
2008	6374.213354247243
2009	6405.768529856999
2010	6573.045046747535
2011	6801.063905435502
2012	7010.2138403182735
2013	7206.878039950113
2014	7266.235567040833
2015	7585.079719440058
2016	7610.201904065026
2017	7752.406944960494
2018	7927.141158653472
2019	7919.955090565023