Year	constant 2010 US$
1987	5086.77576830464
1988	5178.31692355155
1989	5125.82752034084
1990	5489.88391235726
1991	5274.75368109668
1992	5472.71991850476
1993	5908.50533494938
1994	5314.04415894543
1995	5711.26308731962
1996	6309.32783240314
1997	6628.39814002233
1998	7004.92897110121
1999	6597.87099780034
2000	6847.74650037769
2001	6102.72194493247
2002	6593.93574788909
2003	7002.58620135497
2004	7670.37347277974
2005	8340.83571516235
2006	8694.80728639244
2007	9053.01746771588
2008	8854.38880316448
2009	8257.20750814118
2010	8954.72693275058
2011	9627.43582847154
2012	9922.38559435544
2013	10692.4602463913
2014	10995.6447925729
2015	11496.6204633683
2016	11702.7032714126
2017	11994.3181986133