Year	constant 2011 international $
1991	9800.63948422703
1992	8609.03318893112
1993	7216.38205222191
1994	5688.65364527674
1995	4992.8558429307
1996	4548.08764052782
1997	4450.76725330004
1998	4374.28177970257
1999	4371.00986290486
2000	4665.16186237451
2001	5209.76482992149
2002	5554.78496953745
2003	6148.89969609487
2004	6939.98168998415
2005	7207.41186631545
2006	7759.1424883141
2007	8399.76923169758
2008	8693.62339876891
2009	7359.39732962596
2010	7714.91170252981
2011	8089.18490698852
2012	8179.42827948911
2013	8193.57324338372
2014	8145.28814506193
2015	7373.35495157914
2016	7600.69159334818
2017	7670.13210584312
2018	7994.21321175051