Year	constant 2010 US$
1991	3415.44001764644
1992	3406.19407833299
1993	3458.4133978598
1994	3545.03608211
1995	3442.04601439351
1996	3846.39994952957
1997	3856.46798473284
1998	4144.35336750691
1999	4256.02625049275
2000	4091.12854787
2001	4279.21856121189
2002	4432.7267102621
2003	4349.45055633069
2004	4285.73710612687
2005	4375.34574758859
2006	4570.967491091
2007	4313.76968825439
2008	4371.00935744715
2009	4703.88628059811
2010	4975.80018233796
2011	5197.54922311128
2012	5449.36890625918
2013	5615.75328559161
2014	5601.13377703387
2015	5724.69649766133
2016	5656.68574244203
2017	5719.28184547065
2018	5016.28322011852