Year	current international $
2000	4.95564758679671
2001	4.54280934200711
2002	3.67515050147042
2003	3.82824846300493
2004	3.97774523294649
2005	4.08416665883201
2006	4.80144043631753
2007	7.64121283339813
2008	8.08964890413659
2009	8.92712386266626
2010	7.98883040677371
2011	7.05169920082187
2012	8.8725158686529
2013	8.50786101300228
2014	8.47688474564794
2015	10.3713765102894
2016	13.8338630139571
2017	14.0073640493408
2018	13.3367364229873
2019	13.7949034096722
2020	16.7966461405167
2021	16.7775017743043