Year	metric tons
1992	1325023
1993	1136987
1994	1024216
1995	909592
1996	999404
1997	1074720.7
1998	915652
1999	1065306.4
2000	1496224.24
2001	1955915
2002	2133184
2003	1993208
2004	2086640
2005	2056186
2006	2011622
2007	1943652.6
2008	2419910.7
2009	2903361
2010	1928779
2011	2370823.1
2012	2707274.3
2013	2856572
2014	2298047.5
2015	2898559
2016	2965670
2017	2824527.1
2018	3181818
2019	3416764.3
2020	3151182
2021	3258169.4
2022	3055969.7