Year	constant 2015 US$
1995	3537.8981340735977
1996	4056.143228045136
1997	4444.802454858667
1998	4423.610837072467
1999	3621.3593019463633
2000	4119.715171634945
2001	4369.457291195004
2002	4234.682164688554
2003	4301.071256490661
2004	4922.169395245554
2005	5711.102019227312
2006	5258.988999701002
2007	7103.858590407237
2008	10388.90566969475
2009	10286.603912842475
2010	10415.657127128052
2011	11280.705625859944
2012	11970.550992044078
2013	11959.960201977505
2014	11203.678817259113
2015	11735.002513244075
2016	12569.403748389632
2017	12878.247861027208
2018	12293.305349744307
2019	15116.553451843547
2020	20555.404894119518
2021	20010.09894800689
2022	19007.973372024964