Year	constant 2015 US$
2010	6258.443193374381
2011	6440.699189700725
2012	6545.506431816962
2013	6549.087223704633
2014	6484.033866564004
2015	6001.667463028593
2016	6201.618321151412
2017	6248.486627243433
2018	6148.471015449001
2019	6078.819127429982
2020	5731.118646020212