Year	constant 2015 US$
1991	6488.040018955832
1992	6972.8396339085275
1993	7380.375221631578
1994	7650.790824905507
1995	7750.200958188047
1996	7509.569027667305
1997	7787.972037739804
1998	7552.1105630636375
1999	7433.944354314925
2000	7413.048116441637
2001	7524.108664446206
2002	7584.578869453609
2003	7767.535081945645
2004	7937.4890606425615
2005	8099.942293251751
2006	8564.165511974448
2007	9050.061297917855
2008	9236.9466803008
2009	9184.034680088196
2010	9621.601113647648
2011	9846.158887503985
2012	10270.743980875666
2013	10352.737800778732
2014	10599.722057137382
2015	11043.788509960323
2016	11499.783697225701
2017	11698.339832916066
2018	11812.92882497367
2019	11948.810291535969
2020	11421.290761376691
2021	11948.483471050695
2022	12044.816937398213