Year	constant 2011 international $
1990	1653.15890049926
1991	1504.21513243242
1992	1477.69772408654
1993	1464.14896552968
1994	1419.30976241928
1995	1399.81077049851
1996	1385.94494233309
1997	1392.54522486438
1998	1402.25611901404
1999	1422.09630289658
2000	1444.02942941694
2001	1484.40778157891
2002	1257.29355305791
2003	1339.25633149499
2004	1368.18158492365
2005	1389.50091191832
2006	1417.27850751999
2007	1462.85779589435
2008	1523.01956861309
2009	1421.18874873103
2010	1385.68507168039
2011	1367.54195006914
2012	1370.94610291406
2013	1364.33955119378
2014	1372.01595936434
2015	1377.16821269101
2016	1396.67920923666
2017	1418.30958372926
2018	1452.58679209298