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	3
1985	6
1986	10
1987	12
1988	17
1989	13
1990	13
1991	31
1992	40
1993	52
1994	100
1995	100
1996	60
1997	60
1998	60
1999	80
2000	30
2001	500
2002	1008
2003	1008
2004	1008
2005	1008
2006	1000
2007	640
2008	821
2009	1355
2010	2083
2011	2083
2012	987
2013	2205.25
2014	1953
2015	2400
2016	4194
2017	3914
2018	5327
2019	6985
2020	7686
2021	8484
2022	8830