Year	current US$
2000	1.7923159410112801
2001	1.7714036105455981
2002	2.0033003997635506
2003	2.2619420832221495
2004	3.100146836773027
2005	3.751123030039553
2006	4.795273683563997
2007	5.073689786692578
2008	5.949963315798328
2009	6.840070183669318
2010	7.327577448806145
2011	8.699830112270691
2012	8.693056335713917
2013	9.474114254331795
2014	9.628081919748674
2015	8.905005006635122
2016	8.5537099922456
2017	8.950126386839658
2018	9.145380649364734
2019	9.270352900394567
2020	8.935028880798994
2021	11.21419566899622