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	5
2001	11
2002	51
2003	72
2004	92
2005	126
2006	156
2007	190
2008	190
2009	260
2010	310
2011	310
2012	310
2013	57
2014	305
2015	872
2016	655
2017	1339
2018	1792
2019	1934
2020	2062
2021	2808
2022	2336