Year	constant 2010 US$
1991	4567.07369327324
1992	5154.05599000825
1993	5357.70366387421
1994	5717.15399542517
1995	4780.99735627073
1996	4717.1653474533
1997	4518.41552799462
1998	5335.91492729985
1999	5030.23212983378
2000	5489.9692509751
2001	5425.73586337457
2002	5584.02393034291
2003	7903.21859274117
2004	8837.61393088762
2005	9304.30670127143
2006	8269.37962830965
2007	6282.98586086682
2008	6662.54137179651
2009	6684.40549609829
2010	7112.75355891532
2011	6669.83904927665
2012	6982.69330165925
2013	7028.43588691545
2014	7446.79020620423
2015	6743.99240491875
2016	5207.01812180287
2017	4760.4670028988
2018	4828.87583899719