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	45
1988	95
1989	348
1990	515
1991	200
1992	266
1993	649
1994	617
1995	616
1996	380
1997	387
1998	385
1999	398
2000	405
2001	320
2002	418
2003	375
2004	450
2005	430
2006	455
2007	585
2008	631
2009	775
2010	856
2011	966
2012	1060
2013	1076
2014	1400
2015	3167.5
2016	3430
2017	3680
2018	3750
2019	3825
2020	3720
2021	3853