Year	constant 2010 US$
1991	3064.92759048822
1992	3075.93030110685
1993	3391.04303565946
1994	3579.63371353006
1995	3853.61110169217
1996	4062.95683046415
1997	3724.57899847884
1998	3636.13246881194
1999	3782.19386013496
2000	3228.41106323421
2001	3404.23051674268
2002	3215.98335255014
2003	3296.53573386923
2004	3145.79219132847
2005	2927.90157292586
2006	3403.77561504203
2007	3185.29256788457
2008	2973.35849190489
2009	3390.20575005504
2010	3393.88645424344
2011	3724.55315139725
2012	3690.69151506514
2013	3629.66492665413
2014	3460.9350216967
2015	3535.23318429043
2016	4143.71270468216
2017	3848.92588249802
2018	3906.83257303822