Year	constant 2015 US$
2000	7000.258909421749
2001	7539.137701034061
2002	8168.511587963481
2003	8884.155881932704
2004	9588.539173787509
2005	10819.810855144817
2006	11974.405302548626
2007	12932.786222739367
2008	12445.388688931862
2009	10810.868922356993
2010	10851.284495903406
2011	11978.63820956753
2012	12553.276994738551
2013	13112.263207502301
2014	13696.211202981285
2015	14040.886020332035
2016	14709.993239289792
2017	15519.038294554566
2018	16225.932471584969
2019	16768.317776626114
2020	16660.548276259568
2021	18155.62439982141