Year	current US$
2008	5461768
2009	3637332
2010	6763433
2011	153379168
2012	177393165
2013	9211171
2014	11574770
2015	9670946
2016	8440321
2017	8123721
2018	19615088
2019	15781389
2020	11771659
2021	17816472