Year	constant 2011 international $
1990	30333.7541891167
1991	29502.3106715679
1992	28486.7373944631
1993	27527.3798903927
1994	29068.695044427
1995	30121.5002540483
1996	30587.2803898249
1997	31488.6248467423
1998	33132.313026454
1999	35231.0539130506
2000	36928.1425688559
2001	37414.4515857339
2002	38147.8511183323
2003	39453.7284211519
2004	40532.2550709212
2005	41835.8417156827
2006	44086.5313043657
2007	45437.6895115844
2008	45030.0539585988
2009	41885.2774076029
2010	44175.4579337394
2011	44716.9933613879
2012	44359.9217075465
2013	44513.6777254782
2014	45157.3237963772
2015	46167.5179776288
2016	46662.0200282243
2017	47398.4352647432
2018	47937.0780365477