Year	current US$
2000	13.5939215876013
2001	13.917511865903402
2002	15.190015487088019
2003	24.1356536275224
2004	25.45285855693997
2005	28.763841089195882
2006	34.22281520456904
2007	37.12070495971868
2008	43.229830113939954
2009	39.40463373650553
2010	42.201389140325446
2011	45.697753624927444
2012	46.8499068596438
2013	50.864186543934466
2014	53.30193071607861
2015	47.19122222684764
2016	42.26034697269849
2017	41.44239685455849
2018	39.188926460573335
2019	39.26114386813908
2020	40.88310560462998
2021	47.624601300175094