Year	constant 2010 US$
1981	228.642809542016
1982	224.433407527427
1983	235.608011906384
1984	221.737662503603
1985	190.833427579237
1986	202.72070217538
1987	223.552816149266
1988	217.51045149389
1989	209.628901420114
1990	208.079381572326
1991	186.52026948541
1992	164.336602268298
1993	179.404208919047
1994	178.801689835481
1995	183.54790306594
1996	199.922992257154
1997	200.026554690016
1998	187.516734052349
1999	191.571880199971
2000	197.432305149369
2001	207.752705244742
2002	204.938205916459
2003	194.873070098516
2004	215.154562212426
2005	233.944190480862
2006	252.212288224834
2007	273.492119814399
2008	294.805427784673
2009	312.033849443538
2010	341.554114905179
2011	369.202407829027
2012	389.938966721631
2013	419.183860251535
2014	449.420377149128
2015	482.639066335501
2016	514.057306751986
2017	548.117495566997
2018	570.305676779185