Year	current US$
2005	23813100.4884924
2006	19162937.4201384
2007	20482931.8447328
2008	19041351.3734844
2009	20449476.7996661
2010	23317105.5195702
2011	21368539.1601908
2012	6843846.63883729
2013	10532380.1437671
2014	21275911.9825145
2015	33471934.3997091
2016	28900395.4000881
2017	4211919.59811404
2018	-154365.213071298
2019	5661034.62708494
2020	14875570.626186