Year	constant 2015 US$
2004	589.1517912625405
2005	575.8987151081458
2006	538.1712615067036
2007	560.7175004713747
2008	591.0302697484293
2009	596.05129442111
2010	617.0413138093681
2011	511.54793575024206
2012	519.0255418701283
2013	522.511121620288
2014	509.73552343831665
2015	499.498233255963
2016	488.38085273092236
2017	520.545689694428
2018	556.1409188681873
2019	563.8172765368097
2020	542.7508886547873
2021	567.5350473959746
2022	572.5017458705113
2023	558.1102417729692