Year	metric tons
1992	496050
1993	402751
1994	470638
1995	501476
1996	630103
1997	891707
1998	588570
1999	771064
2000	417752
2001	703620
2002	661681
2003	741924
2004	662715
2005	680281
2006	320140
2007	418724
2008	467110.63
2009	375640.19
2010	220200
2011	404700
2012	377300
2013	490624.35
2014	378206.12
2015	363416.42
2016	431206.97
2017	295207.81
2018	370940.58
2019	371418.45
2020	412325.81
2021	437428.28
2022	377724.18