Year	constant 2010 US$
1991	416.857411070545
1992	417.785562786551
1993	420.89317819588
1994	416.720904777816
1995	408.733740244838
1996	417.322017098032
1997	422.003440821518
1998	425.111343921633
1999	429.39554726571
2000	449.880383530965
2001	469.354090797038
2002	478.03249402232
2003	509.589065031366
2004	548.802513109881
2005	591.891088051279
2006	649.869889273375
2007	685.20963539815
2008	708.80559330209
2009	730.652023479409
2010	753.406715762663
2011	787.340742599132
2012	812.884031314552
2013	834.590853574198
2014	869.204248523429
2015	899.414067057708
2016	924.139601013558
2017	944.363741725321
2018	976.44940398986