Year	current US$
2006	18280000.1185387
2007	16719999.987632
2008	20420000.0539422
2009	15180000.0667572
2010	19679999.8879433
2011	13949999.853968602
2012	13629999.9244511
2013	17669999.9161065
2014	16329999.7542053
2015	12692445.9785223
2016	13806390.079204
2017	13893116.8531999
2018	18984713.8598561
2019	17283036.1481756
2020	18285490.447655298
2021	18166610.0118309
2022	19429370.4815209