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	201
1993	127
1994	131
1995	185
1996	145
1997	85
1998	85
1999	48
2000	52
2001	180
2002	151
2003	63
2004	7
2005	26
2006	37
2007	14
2008	8
2009	10
2010	27
2011	60
2012	90
2013	120
2014	227
2015	31
2016	89
2017	90
2018	19
2019	20
2020	20
2021	22
2022	31