Year	current US$
2000	0.06046458
2001	1.73033699
2002	1.25821676
2003	1.29712079
2004	2.3814355
2005	3.61752126
2006	4.54116351
2007	4.74331766
2008	5.28269879
2009	7.6191662
2010	13.31658717
2011	9.11252185
2012	9.11655882
2013	12.36235068
2014	5.20915082
2015	5.09659825
2016	7.26558729
2017	7.89685027
2018	8.30000293
2019	11.78417666
2020	15.31857644
2021	11.3388534