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	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	12
2001	12
2002	12
2003	12
2004	32
2005	32
2006	32
2007	162
2008	162
2009	225
2010	360
2011	600
2012	720
2013	800
2014	1010
2015	1220
2016	1290
2017	1400
2018	1430
2019	1555
2020	1560
2021	1610
2022	1685