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	2
1975	6
1976	7
1977	14
1978	32
1979	49
1980	70
1981	82
1982	107
1983	143
1984	123
1985	180
1986	188
1987	203
1988	215
1989	217
1990	197
1991	223
1992	223
1993	255
1994	225
1995	226
1996	240
1997	231
1998	229
1999	590
2000	530
2001	568
2002	642
2003	666
2004	733
2005	812
2006	1500
2007	1500
2008	1700
2009	1620
2010	2631
2011	2833
2012	3232
2013	3705
2014	4741.56
2015	4974
2016	7646.39
2017	12216.8
2018	9014
2019	8262
2020	9393
2021	9948
2022	7148