Year	constant 2011 international $
1990	1633.61298890675
1991	1678.61178844484
1992	1659.1083079565
1993	1656.49162077177
1994	1672.7506300764
1995	1710.25234331824
1996	1870.87713197738
1997	1954.34666436526
1998	1378.56501326884
1999	1365.77460258736
2000	1410.92454107266
2001	1411.48835559871
2002	1367.1154709222
2003	1343.97664750252
2004	1349.34870868326
2005	1374.02638879444
2006	1372.43874455356
2007	1383.12220024714
2008	1392.51554488536
2009	1403.55295495876
2010	1430.97246260323
2011	1506.69531157217
2012	1442.14684466836
2013	1450.00267686402
2014	1425.77064393984
2015	1474.23678697938
2016	1526.80879978087
2017	1576.74899401892
2018	1596.35546022342