Year	constant 2011 international $
1990	1298.47945759853
1991	1259.79088894806
1992	1184.22504559823
1993	984.706762348284
1994	1107.0804451519
1995	1164.08661018533
1996	1231.25546981055
1997	1365.22337841697
1998	1291.64447036698
1999	1282.71831286754
2000	1235.46482862298
2001	1182.19705375651
2002	1140.99021111501
2003	1167.50458306851
2004	1162.3442657383
2005	1145.91213124786
2006	1161.0574169635
2007	1156.05989912211
2008	1170.77597425239
2009	1202.51931582117
2010	1241.92066902775
2011	1286.47049660966
2012	1334.66076671312
2013	1379.39899388641
2014	1423.55300158527
2015	1467.24515929218
2016	1501.11998584966
2017	1529.5153677241
2018	1565.45720561758