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	23
1987	0
1988	0
1989	542
1990	99
1991	158
1992	301
1993	602
1994	656
1995	950
1996	1004
1997	1397
1998	1642
1999	3163
2000	3630
2001	4460
2002	4400
2003	10160
2004	11426
2005	11078
2006	7624
2007	3172
2008	4528
2009	5725
2010	7410.7
2011	5102
2012	5883.2
2013	7160
2014	7214.96
2015	4206
2016	1151
2017	565
2018	576
2019	579
2020	559
2021	609
2022	1130