Year	current international $
2000	18
2001	18
2002	18
2003	19
2004	19
2005	23
2006	24
2007	26
2008	30
2009	35
2010	37
2011	42
2012	45
2013	43
2014	44
2015	50
2016	54
2017	59
2018	65
2019	71
2020	78
2021	81