Year	constant 2015 US$
1991	4870.925958391998
1992	5441.41082053777
1993	5021.57290577114
1994	6015.577030005192
1995	5799.529003112901
1996	5454.113770016859
1997	6070.782917932141
1998	6370.8522460703125
1999	6473.6476733953605
2000	6730.029249660628
2001	6394.8479303041
2002	6593.747685151858
2003	6939.176824137783
2004	7680.6674509172435
2005	8256.403340737073
2006	8707.965373665453
2007	9077.756147273361
2008	9695.810955264129
2009	9676.432862791353
2010	9453.030939011574
2011	10327.159410140664
2012	11780.304976534588
2013	11941.2708054235
2014	12251.723122983596
2015	12350.347664387667
2016	12534.094141633384
2017	13089.031083315615
2018	13812.318899096686
2019	13832.405892580671
2020	14339.789256119187
2021	14413.942715803387
2022	13864.723984842884