Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	1690
1993	1201
1994	1038
1995	516
1996	419
1997	364
1998	211
1999	216
2000	140
2001	95
2002	80
2003	130
2004	350
2005	500
2006	600
2007	900
2008	1000
2009	1000
2010	1000
2011	517
2012	366.1
2013	325
2014	305
2015	561
2016	640
2017	695
2018	478
2019	531.4
2020	533
2021	507
2022	466