Year	current US$
2000	11.64748025670598
2001	11.693907850088104
2002	12.73703638606592
2003	14.640721873157485
2004	17.187532223525597
2005	19.445684945216005
2006	22.835754756853554
2007	26.96175688669385
2008	31.658302616734108
2009	32.557523322527935
2010	33.45145097081297
2011	36.898142587587806
2012	38.615767796505274
2013	42.375482846744134
2014	44.41347472826783
2015	43.216089711849875
2016	42.721461232767744
2017	43.04570500776718
2018	42.03248405845513
2019	43.047046637010226
2020	43.958823479470446
2021	47.12790362005827