Year	constant 2010 US$
1993	283.697232297316
1994	285.526787285298
1995	280.950122741878
1996	262.365530415565
1997	241.003275770539
1998	249.638548165691
1999	230.184181819777
2000	227.172493342534
2001	219.227117247721
2002	191.739073472276
2003	229.838101657435
2004	232.971102687874
2005	241.477990794876
2006	234.084358652593
2007	243.19445004679
2008	236.647111687398
2009	234.046296192176
2010	241.994766090485
2011	219.630941637966
2012	246.743136243247
2013	268.88664566755
2014	280.329196458391
2015	289.261313766108
2016	286.681968640413
2017	284.049325862557
2018	280.071501778444