Year	current US$
2000	0.87548536
2001	0.86646468
2002	1.36221589
2003	1.05726199
2004	0.92484093
2005	2.43491582
2006	2.12386418
2007	2.40391288
2008	3.22646895
2009	3.45289055
2010	6.38455382
2011	4.97521511
2012	5.32015793
2013	5.75046216
2014	11.42999783
2015	9.75892266
2016	9.53172504
2017	10.5773947
2018	13.41510618
2019	12.67564289
2020	12.90590489
2021	13.08477697