Year	constant 2015 US$
1993	7776.717304236821
1994	8131.996996208643
1995	8392.928573333853
1996	8875.13381760068
1997	8783.834242996201
1998	8990.537360983057
1999	9049.159759816219
2000	9215.823051106816
2001	9607.334440701816
2002	9937.930556549456
2003	10347.495191529304
2004	10773.782978644389
2005	11425.607806430484
2006	11783.207828830087
2007	12413.348047388385
2008	12482.068991329517
2009	11701.825309235543
2010	11670.206896236132
2011	11615.90969513379
2012	11714.016701942708
2013	11790.091091743298
2014	12152.505485912627
2015	12903.368094770947
2016	13310.347361305612
2017	14139.80447387646
2018	14575.907098792444
2019	14854.958836226853
2020	14009.649934964667
2021	14922.17974997107