Year	constant 2015 US$
1999	8203.20494005082
2000	8535.441051117486
2001	8952.103791382706
2002	9516.554912523305
2003	9941.15378884827
2004	10421.449013021636
2005	10758.932125601103
2006	11099.088414525531
2007	11019.610822283812
2008	11188.670602548744
2009	10769.29921190221
2010	10869.076207751234
2011	10969.58273889234
2012	10870.067217981734
2013	11278.61390860697
2014	11636.952999826033
2015	12108.319693982052
2016	12724.133453280874
2017	13043.392182286925
2018	13656.862186271908
2019	14539.538195920508
2020	14175.180928813937
2021	14747.30880677889
2022	14818.513970488424