Year	constant 2015 US$
2007	5152.172883469267
2008	5157.077892835871
2009	4843.340050729555
2010	4838.193927120541
2011	4910.391615394384
2012	4962.671507730813
2013	4918.0645456806205
2014	4941.462741275786
2015	4920.09573262041
2016	4914.222856506305
2017	5023.138805840881
2018	5061.952055510825
2019	5156.331442169105