Year	constant 2010 US$
1991	2841.00007521119
1992	2806.98660180331
1993	2693.9759186781
1994	3221.31366900005
1995	3272.80207985854
1996	3324.28654854355
1997	3362.53283138731
1998	3414.09830283819
1999	3497.57176725106
2000	3465.62003226749
2001	3476.29546574948
2002	3482.0181933436
2003	3509.17696005921
2004	3561.44472387063
2005	3549.86785786935
2006	3613.91788748804
2007	3758.18561577223
2008	3760.41874958376
2009	3645.93198791181
2010	3757.58715288352
2011	3784.70990140327
2012	3844.10357371551
2013	3963.80278459343
2014	4067.59567871538
2015	4152.12815453857
2016	4246.92030771675
2017	4322.2155411144
2018	4030.6534677471