Year	current international $
2000	4.04817725226309
2001	4.71060892131061
2002	5.77966416423523
2003	17.8867583720165
2004	16.0904435601773
2005	14.8065871722366
2006	14.903267521013
2007	18.8887849154493
2008	21.6451368532751
2009	23.3762522209783
2010	26.8127255116987
2011	31.0373667263702
2012	29.7861803224841
2013	32.663444581706
2014	36.5159153667489
2015	37.1058898578192
2016	41.1255602423917
2017	43.1265256429292
2018	49.1628700288663
2019	57.4700902676052
2020	65.9286107241902
2021	73.5307029481464