Year	constant 2015 US$
1995	8391.582355735585
1996	8721.482562593124
1997	9274.258632283074
1998	9546.578097217334
1999	9421.347938256386
2000	9709.182647155842
2001	10027.024621611034
2002	10452.798126485486
2003	10511.196760079984
2004	11166.203009834595
2005	12067.740169238752
2006	12912.09463229748
2007	14171.510511980898
2008	14913.585920967666
2009	14136.029400625834
2010	14743.911456608535
2011	14745.125351099494
2012	15019.07899795924
2013	15153.904226232995
2014	15468.76251088723
2015	15991.232587780394
2016	16184.398255263735
2017	16693.559469233478
2018	17283.677980600933
2019	17503.653988169874
2020	17103.896448608444
2021	17451.81054877223
2022	17340.514256811213
2023	17497.87845952122