Year	constant 2015 US$
1992	601.1630234096923
1993	661.3031952876937
1994	777.6679747734772
1995	757.3585240452476
1996	788.4281280124088
1997	840.5770171635119
1998	843.9888354552689
1999	832.0224896321337
2000	793.6205616041645
2001	838.8989131544165
2002	835.1099976397755
2003	780.4681391897143
2004	760.3487878293907
2005	761.0317824219625
2006	741.0007432974407
2007	739.7393434080044
2008	649.6944623055286
2009	657.7864581978309
2010	658.5862715367646
2011	702.3966324696935