Year	constant 2015 US$
1991	7885.359880913527
1992	8080.62752933618
1993	8266.811979144444
1994	8553.312424670094
1995	8880.19480056505
1996	9001.783109850614
1997	9208.90557725463
1998	9519.778305994947
1999	9771.501066469176
2000	10108.670062973302
2001	13940.572490394054
2002	13784.260085118627
2003	12593.53252357937
2004	12491.353771332708
2005	12649.050863385632
2006	13028.313044445697
2007	13548.649818432688
2008	13876.401409778942
2009	13742.180599076748
2010	13958.097826964698
2011	14456.461919063504
2012	12076.930672291415
2013	12518.248679219121
2014	13030.39841506068
2015	13220.405474445053
2016	13170.115027515494
2017	13319.237132851533
2018	13895.621926740603
2019	13869.565327228287
2020	13891.157745026157
2021	14370.48434886396
2022	13916.968539115085