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	20
1991	20
1992	22
1993	57
1994	66
1995	67
1996	67
1997	62
1998	62
1999	65
2000	70
2001	70
2002	88
2003	142
2004	192
2005	192
2006	273.5
2007	360.5
2008	605.6
2009	665.6
2010	695.64
2011	532.13
2012	679.35
2013	671.56
2014	647.34
2015	625.73
2016	525.2
2017	506.93
2018	342.48
2019	388.96
2020	320.72
2021	321
2022	340