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	2
1990	2
1991	3
1992	3
1993	4
1994	4
1995	15
1996	15
1997	13
1998	13
1999	13
2000	22
2001	7
2002	7
2003	7
2004	25.5
2005	25.5
2006	25.5
2007	19.3
2008	12.69
2009	27.36
2010	13.5
2011	5.75
2012	6.55
2013	7.55
2014	5.45
2015	23.8
2016	11.1
2017	7.45
2018	7.45
2019	54
2020	4.2
2021	18.2
2022	7.4