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	2
1985	2
1986	3
1987	3
1988	2
1989	2
1990	2
1991	3
1992	5
1993	8
1994	28
1995	39
1996	62
1997	57
1998	158
1999	558
2000	558
2001	102
2002	83
2003	80
2004	80
2005	78
2006	126
2007	124
2008	124
2009	126
2010	130
2011	130
2012	48
2013	46
2014	45
2015	45
2016	50
2017	50
2018	62
2019	62
2020	72
2021	72
2022	87