Year	current international $
2000	3.38540181925861
2001	3.65461650041696
2002	3.01302081011118
2003	2.53106922951914
2004	2.72887326318606
2005	2.86441814922886
2006	3.30461837689727
2007	3.46341530980493
2008	3.59902308054173
2009	3.25795102662697
2010	3.87475981312799
2011	3.69463080730019
2012	3.45892145501338
2013	3.56303702712776
2014	3.48575280285029
2015	3.38681524720791
2016	3.4601154735038
2017	3.44000196760885
2018	3.76488369358723
2019	4.34284715941234
2020	4.36888862676613
2021	4.44791317815891