Year	constant 2015 US$
2008	628.202720471009
2009	640.6764416997834
2010	656.5050301882314
2011	655.969610509354
2012	684.06433333248
2013	718.2107781040338
2014	765.0602998540606
2015	790.9032646776914
2016	819.2299425027387
2017	840.2267846821206
2018	873.8016942457057
2019	893.1069778834292
2020	881.5466269846571
2021	877.652941325665