Year	constant 2010 US$
1980	3612.38388400625
1981	3973.96122828336
1982	3793.82173490695
1983	3763.64940332303
1984	3570.21101591887
1985	2981.38266051903
1986	3199.15787787006
1987	3573.12430202154
1988	3237.4010375201
1989	3379.78848249179
1990	3570.52431871377
1991	3810.87222811638
1992	3879.33389737891
1993	3744.68433472424
1994	3711.83561890953
1995	3857.76441379111
1996	3824.31930115733
1997	3896.02444308528
1998	3970.91205344129
1999	3927.09077993035
2000	4122.11746274816
2001	4073.35445112136
2002	4272.52483960326
2003	4526.28515272716
2004	4825.87068469282
2005	4742.84613740504
2006	5032.839018861
2007	5057.87788391472
2008	5105.70279499528
2009	5014.96354501968
2010	5120.35286032915
2011	5347.52653808707
2012	5436.21733485289
2013	5847.82394839173
2014	6140.72564749182
2015	6380.53085130382
2016	6238.69129041605
2017	5998.27402337049
2018	5939.22811533184