Year	metric tons
1992	271733
1993	266735
1994	215435
1995	242350
1996	387377
1997	559463
1998	490619
1999	474338
2000	544994
2001	477651
2002	687559
2003	866197
2004	860340
2005	902912
2006	892884
2007	906552
2008	909500
2009	1399868
2010	1382559
2011	1034798.1
2012	1175450.4
2013	1328800
2014	1257988.9
2015	1324044.4
2016	1367078.2
2017	1365514.8
2018	1218840
2019	1336387.1
2020	1280813.56
2021	1398459.88
2022	1324014.35