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	2
1976	5
1977	15
1978	30
1979	80
1980	180
1981	380
1982	993
1983	1366
1984	1507
1985	2804
1986	3460
1987	3460
1988	4187
1989	3701
1990	3439
1991	3877
1992	3820
1993	5106
1994	6291
1995	5503
1996	5079
1997	7217
1998	7233
1999	2327
2000	1779
2001	3127
2002	3638
2003	6228
2004	7048
2005	7778
2006	8764
2007	8943
2008	8354
2009	6609.38
2010	6597.53
2011	7588.2
2012	7773.6
2013	8635.2
2014	10635
2015	9550.32
2016	8807.4
2017	9900.36
2018	8825.4
2019	7225.22
2020	3909.1
2021	6724.44
2022	11847.21