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	3
1993	3
1994	1
1995	1
1996	1
1997	1
1998	106
1999	200
2000	345
2001	422
2002	422
2003	260
2004	288
2005	242
2006	180
2007	118.3
2008	74.4
2009	41.16
2010	71.1
2011	96
2012	74.2
2013	78.7
2014	82.82
2015	122.17
2016	102.1
2017	106.75
2018	72.4
2019	69.5
2020	37
2021	40
2022	45