Year	current international $
2000	15.8843659553481
2001	19.3081671396766
2002	22.9451791576756
2003	24.6487354856711
2004	25.4308554671901
2005	28.7209815796407
2006	31.1711818243966
2007	31.7061219292399
2008	34.6208777638903
2009	34.2397714059212
2010	35.9284431110052
2011	38.4181734818467
2012	39.0515294223615
2013	39.0839088543351
2014	39.7730975301564
2015	38.321741615531
2016	41.4030823574305
2017	41.294364533276
2018	41.5464680443448
2019	44.4063656940509
2020	45.4747162033217
2021	48.9348374047136