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	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	4685
2003	6635
2004	6394
2005	7070
2006	7621
2007	7442
2008	7589
2009	7620
2010	7620
2011	4970.2
2012	3638.3
2013	2923.5
2014	3397
2015	4490.6
2016	4603.6
2017	3800.4
2018	3678.8
2019	3997.4
2020	3815.8
2021	3858.6
2022	3959.9