Year	metric tons
1992	7135000
1993	7329074.21
1994	5951814.52
1995	5329554.84
1996	5496095.16
1997	5937335.48
1998	4510975.8
1999	3427316.12
2000	4579256.44
2001	4885396.76
2002	5723737.08
2003	5132062.2
2004	6604944.45
2005	6104298.71
2006	5700180.97
2007	7029909.22
2008	8728461.48
2009	8169503.73
2010	6741683.99
2011	7996331.18
2012	8843847.86
2013	7233152
2014	9033775
2015	8186980
2016	7075658
2017	7529412
2018	5813781
2019	6991979
2020	8403688
2021	6914963.89
2022	6800828.75