Year	constant 2015 US$
2003	3309.5103549521955
2004	3581.982146760918
2005	3835.4868064968573
2006	3900.754680137579
2007	4041.3583809305096
2008	3907.660304883978
2009	3953.6071890355142
2010	4061.555914933205
2011	4025.954802744388
2012	4009.9054679982305
2013	4509.231795768185
2014	4508.608330774312
2015	4393.516674685237
2016	4595.224577046687
2017	4472.749942080162
2018	4581.301568160061
2019	4502.899225273542
2020	4317.333194458273
2021	4355.878965980548
2022	4363.84121232257