Year	current US$
2000	1.7819760814981458
2001	1.7169890511225387
2002	1.9399034599694225
2003	2.1160850061554597
2004	2.9193813945329627
2005	3.6239551241326087
2006	4.793942518638278
2007	5.062854141176782
2008	5.917296802775263
2009	6.918571413403015
2010	7.404828156835712
2011	8.859430734503889
2012	8.833375039907033
2013	9.337605313089728
2014	9.506486196044209
2015	8.590408988589802
2016	8.596529409726697
2017	8.935743085654988
2018	9.257146177895642
2019	9.39268943193449
2020	8.846499678219914
2021	11.028989865546677