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	48
1984	47
1985	61
1986	91
1987	121
1988	177
1989	243
1990	240
1991	243
1992	191
1993	234
1994	121
1995	139
1996	106
1997	99
1998	140
1999	190
2000	66
2001	64
2002	68
2003	69
2004	72
2005	80
2006	21
2007	25
2008	215
2009	243
2010	285
2011	335
2012	405
2013	465
2014	520
2015	579
2016	643
2017	692
2018	640
2019	731
2020	900
2021	911
2022	976.6