Year	current US$
2000	2.79811163
2001	3.56555646
2002	3.42611768
2003	7.1973164
2004	8.54085614
2005	6.39157974
2006	3.98656959
2007	3.01329364
2008	3.22484883
2009	3.03236732
2010	5.66962216
2011	11.57727423
2012	11.13276741
2013	13.49756812
2014	17.82740285
2015	6.56565411
2016	7.99771095
2017	14.75829757
2018	9.77941145
2019	13.66966965
2020	10.69804354
2021	25.38980953