Year	constant 2010 US$
1991	3542.51236229053
1992	3814.48195328722
1993	3933.35866150992
1994	4525.22382998262
1995	4975.79655486914
1996	5366.48208682694
1997	5959.09451572604
1998	6539.51028092928
1999	6949.3198296218
2000	7839.75808551212
2001	7995.90056513679
2002	8189.3292331887
2003	8306.77129704437
2004	8858.32636691153
2005	9145.85553194107
2006	9544.39152156456
2007	8421.95692820045
2008	8510.08029102853
2009	8302.0915884882
2010	8203.67875745947
2011	8210.84074711823
2012	8267.42092508373
2013	8125.67402380415
2014	7929.22196972696
2015	7708.00995925366
2016	7941.03018349736
2017	8074.17204851216
2018	8242.8149417608