Year	constant 2011 international $
1990	1301.60714220019
1991	1262.49324144905
1992	1189.40845326637
1993	986.558639432872
1994	1081.83188801397
1995	1154.58415756867
1996	1235.67734749892
1997	1371.44886360842
1998	1299.784653412
1999	1280.14273573656
2000	1235.81719309048
2001	1181.9721615022
2002	1148.0570366098
2003	1175.84810196503
2004	1168.30979460794
2005	1153.40465739775
2006	1168.59497487493
2007	1164.44052256843
2009	1220.11608031456
2010	1259.2803808219
2011	1364.14322561122
2012	1361.47437231713
2013	1412.78096675719
2014	1463.00885530998
2015	1539.38634465656
2016	1544.72399275351
2017	1560.0937917303
2018	1592.53670171198