Year	constant 2010 US$
1991	8627.11859450305
1992	8761.37868822616
1993	8886.71308909145
1994	8755.45167471692
1995	9072.76839612599
1996	9168.29010922621
1997	8811.66250518705
1998	8533.16819910834
1999	8206.28670856631
2000	8220.23423912123
2001	8150.07100086688
2002	7948.01781546441
2003	7691.59380347542
2004	7937.23261231338
2005	8061.49672704335
2006	8097.30366669591
2007	7919.20084646828
2008	7878.82151270696
2009	7792.15642708336
2010	7876.83818057944
2011	8168.41993139712
2012	8079.54144355787
2013	7868.90864479591
2014	8031.47702537614
2015	8355.94163814875
2016	8388.18380667134
2017	8422.30211586677
2018	8498.4733970805