Year	constant 2015 US$
1991	8597.13203377815
1992	8685.762762620558
1993	8782.423225869648
1994	8786.855485882905
1995	9038.79154590046
1996	9105.52304491344
1997	9259.157385842356
1998	9220.34561094603
1999	9248.002884135969
2000	9246.818635181608
2001	9171.858069352254
2002	9114.85273347822
2003	9148.525207391216
2004	9275.33166254479
2005	9535.255094635599
2006	9803.752326778807
2007	10182.008596257243
2008	10418.31236313677
2009	10397.318767675248
2010	10636.594777877275
2011	10889.080490731625
2012	11099.035273677586
2013	11276.262944423743
2014	11488.76412100599
2015	11630.202159893825
2016	11716.999929510268
2017	11828.009290165775
2018	11868.426244904524
2019	11879.809773817738
2020	11898.1555040894
2021	12268.558433607146
2022	12144.944635432446