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	195
1993	164
1994	196
1995	208
1996	78
1997	130
1998	131
1999	135
2000	208
2001	128
2002	148
2003	162
2004	213
2005	271
2006	147
2007	177
2008	166
2009	222
2010	236
2011	268
2012	249
2013	334
2014	282
2015	350
2016	122
2017	87
2018	140
2019	399.5
2020	472.88
2021	514
2022	447