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	10
1985	42
1986	42
1987	37
1988	51
1989	69
1990	49
1991	6
1992	10
1993	8
1994	4
1995	24
1996	1
1997	1
1998	1
1999	1
2000	2
2001	13
2002	25
2003	52
2004	30
2005	85
2006	52
2007	30
2008	20
2009	17
2010	1
2011	1
2012	1
2013	1
2014	9.35
2015	9.33
2016	9
2017	6
2018	6.84
2019	6
2020	6
2021	1
2022	1