Year	constant 2015 US$
1991	8002.1022679343605
1992	8739.211862921744
1993	10152.423272438058
1994	11072.417630964577
1995	11417.562642476216
1996	11931.367871227503
1997	12840.973468032327
1998	11408.119251228369
1999	11528.704465399218
2000	11929.602298422848
2001	12385.364140313963
2002	12602.540293601882
2003	12596.711199368325
2004	12716.196119843986
2005	13323.704771134122
2006	13922.029689436462
2007	15529.911845017174
2008	16346.94574036774
2009	15645.92872030298
2010	16091.015058678333
2011	16435.373425894653
2012	16800.56487377997
2013	16954.776506601043
2014	17487.735302536126
2015	17916.270372047413
2016	18310.402298548233
2017	19049.90992098949
2018	19699.304298673957
2019	20302.217981915557
2020	19337.370751764716
2021	19296.330717174755
2022	21083.071207068497