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	3
1985	3
1986	2
1987	2
1988	1
1989	1
1990	1
1991	1
1992	5
1993	5
1994	5
1995	4
1996	4
1997	0
1998	0
1999	0
2000	0
2001	0
2002	2
2003	2
2004	2
2005	100
2006	110
2007	110
2008	170
2009	177
2010	185
2011	187.2
2012	292.5
2013	322.8
2014	351
2015	409
2016	477.8
2017	572.9
2018	686.6
2019	806.2
2020	1135
2021	1150
2022	1180