Year	metric tons
1993	3150687
1994	3701137.36
1995	3490484.67
1996	3322454.73
1997	3741302
1998	3485707.64
1999	2829922
2000	2202543
2001	3212188
2002	3197881
2003	2490571
2004	3797352
2005	3585251
2006	2928803
2007	2793485
2008	4137019
2009	3332824
2010	2554376
2011	3714041
2012	3035809.8
2013	3411961
2014	4707654.8
2015	3805712
2016	4847544
2017	3484061
2018	4020160
2019	4104050
2020	4580900
2021	4289470
2022	3382800