Year	constant 2010 US$
1991	281.248498245952
1992	339.859241369998
1993	338.369714846653
1994	335.156210109519
1995	316.318923507384
1996	306.663787728375
1997	298.992900905063
1998	336.541747735009
1999	356.725611043739
2000	336.827200885148
2001	372.432442823709
2002	260.862994980761
2003	269.899200308891
2004	264.671532582554
2005	266.561485618727
2006	235.285656078786
2007	230.241319061513
2008	271.322248997867
2009	290.333557067225
2010	276.026941628252
2011	288.257853210501
2012	277.658265887428
2013	340.886023216205
2014	346.990383172148
2015	319.809321808035
2016	386.259792342488
2017	391.907084231068