Year	current US$
2007	15432769
2008	17442189
2009	14823026
2010	37069953
2011	48204674
2012	52913603
2013	44104414
2014	33146951
2015	24935819
2016	15511282
2017	19397571
2018	19560045
2019	14175220
2020	13485139
2021	22371253
2022	35257665