Year	current US$
2000	2.17241093
2001	2.32513552
2002	2.68899422
2003	2.80840537
2004	3.31123958
2005	6.05636032
2006	6.7959418
2007	5.76138493
2008	7.30302802
2009	7.02997033
2010	6.17177736
2011	6.44541467
2012	5.44821504
2013	7.33420325
2014	7.13802505
2015	5.34786315
2016	5.44770628
2017	9.69988052
2018	10.02233736
2019	11.14250454
2020	13.06805
2021	12.53374796