Year	metric tons
2000	2513100
2001	2358600
2002	2639300
2003	2560990
2004	2931988
2005	2786575
2006	2684227
2007	2718733
2008	3113270
2009	3255409
2010	3041408
2011	2939102
2012	2957908
2013	3097497
2014	3162852
2015	3163733
2016	2287774
2017	2764392
2018	2431020
2019	2814390
2020	2565850
2021	2452580
2022	2779540