Year	constant 2015 US$
1991	12694.85528717622
1992	11781.375749056917
1993	10437.77119346527
1994	10313.358601811815
1995	10106.245552043913
1996	10918.819322556865
1997	11280.769469733736
1998	11305.048332725468
1999	11409.924227611622
2000	11901.228420460759
2001	11987.18183448695
2002	12325.066176990562
2003	12829.925786653173
2004	13252.320743212684
2005	13863.931958491481
2006	14604.639886474606
2007	15529.839498564514
2008	16006.105159209363
2009	15396.299952509704
2010	15684.6940799363
2011	16163.043029666896
2012	16763.838073992454
2013	17158.410246010248
2014	17377.936478071242
2015	17332.731600268744
2016	17362.70376675949
2017	17894.10242503501
2018	18411.388854923065
2019	18933.935480259875
2020	19059.066476464835
2021	20470.784824592516
2022	22478.024899043114