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	1
1997	2
1998	0
1999	0
2000	0
2001	1
2002	0
2003	0
2004	0
2005	11
2006	36
2007	36
2008	36
2009	36
2010	36
2011	36
2012	36
2013	56
2014	56
2015	10
2016	10
2017	10
2018	10
2019	22
2020	22.8
2021	113.9
2022	97.85