Year	constant 2011 international $
1990	4761.22963799363
1991	4651.20429857157
1992	4238.31841898683
1993	3118.90348824696
1994	3060.33620736515
1995	3407.97452350337
1996	3747.16400424938
1997	3892.47341968191
1998	3945.59493029686
1999	3902.77419566238
2000	3892.3169253943
2001	3924.31619624163
2002	4314.5409381466
2003	4295.90856883368
2004	4604.65704387396
2005	5112.58920166573
2006	5500.24253587994
2007	6044.21715551043
2008	6474.37642342765
2009	6292.53485632204
2010	6360.44193782807
2011	6346.39512245023
2012	6645.08562465345
2013	6730.94582201132
2014	6813.05210589335
2015	6644.85725505813
2016	6258.37662755942
2017	6044.97203549524
2018	5725.32723774516