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	2
1978	38
1979	25
1980	20
1981	32
1982	135
1983	162
1984	382
1985	1019
1986	1692
1987	2408
1988	2901
1989	3783
1990	3647
1991	3415
1992	3669
1993	4109
1994	4334
1995	4790
1996	4792
1997	5145
1998	5484
1999	8282
2000	9134
2001	10069
2002	11654
2003	14102
2004	16907.5
2005	17753.5
2006	16607.74
2007	9662.989999999998
2008	10924.130000000001
2009	11557.84
2010	11983.8
2011	6676.150000000001
2012	6945.58
2013	8396.099999999999
2014	8647.37
2015	5462.84
2016	2670.84
2017	2823.0199999999995
2018	2719.58
2019	2303.43
2020	1847.14
2021	1985.8500000000001
2022	3349.23