Year	current US$
2000	0.37366466
2001	0.4331738
2002	0.49340107
2003	3.12904445
2004	2.98693418
2005	3.24536599
2006	3.8897291
2007	2.21415834
2008	2.23544428
2009	2.92787632
2010	2.17012637
2011	4.93300269
2012	4.06330943
2013	3.19831997
2014	4.75199891
2015	5.97800049
2016	7.50454845
2017	6.18668845
2018	6.24815284
2019	5.97553149
2020	7.43904554
2021	7.85995508