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	3
1984	50
1985	193
1986	301
1987	323
1988	277
1989	221
1990	280
1991	615
1992	815
1993	1347
1994	3982
1995	2206
1996	789
1997	677
1998	810
1999	748
2000	2125
2001	2647
2002	3554
2003	1944
2004	2000
2005	980
2006	980
2007	1080
2008	1080
2009	1230
2010	1280
2011	2147.9
2012	1031.8
2013	1575
2014	2180.5
2015	2290
2016	2095
2017	2639
2018	3009
2019	3165
2020	3430
2021	3750
2022	3750