Year	current US$
2000	0.34575707
2001	1.71901545
2002	2.33645839
2003	2.35139586
2004	3.04317075
2005	4.38092589
2006	4.97023906
2007	4.16046121
2008	6.993959
2009	7.51939875
2010	8.94810546
2011	10.67744065
2012	9.78884813
2013	8.71652566
2014	8.4628261
2015	5.61808601
2016	8.05272566
2017	7.30641844
2018	11.16266814
2019	8.64447453
2020	9.21161773
2021	11.26743151