Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	100
1971	100
1972	200
1973	200
1974	98
1975	66
1976	81
1977	146
1978	123
1979	92
1980	149
1981	136
1982	124
1983	0
1984	39
1985	36
1986	34
1987	34
1988	43
1989	11
1990	7
1991	12
1992	11
1993	26
1994	42
1995	60
1996	78
1997	74
1998	23
1999	155
2000	104
2001	105
2002	109
2003	98
2004	52
2005	54
2006	45
2007	45
2008	54
2009	71
2010	79.6
2011	334.67
2012	399.3
2013	706.8
2014	1012
2015	1212.5
2016	2078.83
2017	1010.7
2018	1108
2019	1010
2020	1100
2021	1150.5
2022	1585.1