Year	metric tons
2006	8416678
2007	6261226.33
2008	8853132.9
2009	9004416.94
2010	9295194.02
2011	9082265.94
2012	6379255.23
2013	9123502.57
2014	10876563.72
2015	8458144.98
2016	10893437.65
2017	6817938.55
2018	10553412.55
2019	10461063.04
2020	11471969
2021	10260822.82
2022	8037358.35