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	97
1988	86
1989	110
1990	113
1991	242
1992	284
1993	160
1994	143
1995	68
1996	58
1997	13
1998	164
1999	138
2000	154
2001	414
2002	462
2003	309
2004	457
2005	351
2006	306
2007	84.3
2008	62
2009	51
2010	17
2011	20
2012	20
2013	19.92
2014	20
2015	20
2016	16
2017	16
2018	16
2019	16
2020	11
2021	11
2022	11