Year	constant 2015 US$
1993	25489.149492760484
1994	24687.93102130047
1995	24881.071334738597
1996	25395.409721952597
1997	25390.382474451115
1998	25655.80756233634
1999	26307.94270153398
2000	27412.8085336777
2001	28124.019469056348
2002	28080.700163871963
2003	29322.152162171285
2004	30280.5043585137
2005	31239.366389746847
2006	31996.813691179912
2007	33497.883771388406
2008	33515.67584550432
2009	31693.338279220967
2010	32283.362291313202
2011	32377.90425456122
2012	32449.471606490275
2013	32310.911927545843
2014	32954.57945011541
2015	34145.38080635792
2016	34387.405974564346
2017	35331.920477925276
2018	36117.72034943306
2019	37114.21296176367
2020	36437.75342743877
2021	38482.76151702907
2022	38663.78867213044