Year	constant 2015 US$
2006	4247.060796484504
2007	4463.054962201413
2008	4681.501997411082
2009	5275.57842382042
2010	5861.006844664608
2011	5975.551352886895
2012	6412.839939078594
2013	6699.040473332194
2014	6992.620231300889
2015	6834.999067890422
2016	7042.62891195913
2017	7167.938439733689
2018	7467.333277774227
2019	7679.671442428248
2020	7772.101983533788
2021	7856.051782986653
2022	7947.071686763653