Year	current US$
2000	1.4281617751806301
2001	0.9331514807071565
2002	1.2648658093986338
2003	1.900272131651549
2004	2.1191930751762302
2005	2.4031952203257703
2006	3.239019067565098
2007	3.846351375243236
2008	4.619744396120152
2009	4.185028348824633
2010	5.110979471512049
2011	5.984551689570939
2012	6.007279319763117
2013	8.209252188566548
2014	8.881419573674698
2015	6.604512068903533
2016	6.382445210132339
2017	5.712606981627968
2018	6.1356150946864485
2019	7.2432485564157725
2020	6.2899793756513755
2021	7.68098931447187