Year	constant 2010 US$
1991	6343.44336758791
1992	6406.56555091041
1993	5295.80245195944
1994	5771.15752949735
1995	5921.38986006039
1996	5810.3598280286
1997	6019.1412371651
1998	6083.83722002768
1999	5956.27300927871
2000	5951.72653659851
2001	5108.22790578065
2002	5187.82139165877
2003	6596.09397431356
2004	7217.50807376029
2005	7441.63651507106
2006	7431.91891570332
2007	8112.58016062619
2008	9502.97344074376
2009	9338.08443343095
2010	7938.55801593384
2011	7951.76477096777
2012	7204.95011672521
2013	6924.80651498647
2014	7114.77378585338
2015	7321.3758544042
2016	7660.15103677648
2017	6633.08963449402
2018	6284.51929148509