Year	constant 2010 US$
1988	980.639219495116
1989	931.159402356149
1990	922.686295568063
1991	923.699594208078
1992	857.050933404836
1993	797.361613939861
1994	691.221109705214
1995	748.814173634505
1996	767.697600185416
1997	773.277289615101
1998	775.049594510297
1999	780.883214710153
2000	777.358971427523
2001	752.440198807137
2002	733.532424111272
2003	722.840146234289
2004	687.897210501051
2005	683.392142311908
2006	697.206224413854
2007	709.092429623232
2008	704.359549948456
2009	716.097800506169
2010	667.866768094004
2011	695.953209551927
2012	707.364895091932
2013	723.319910118933
2014	735.189971886217
2015	733.030933819934
2016	735.203853667388
2017	734.378931767118
2018	734.700297949948