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	10
1975	23
1976	27
1977	22
1978	24
1979	27
1980	23
1981	15
1982	19
1983	20
1984	13
1985	23
1986	25
1987	26
1988	30
1989	30
1990	30
1991	25
1992	33
1993	40
1994	40
1995	40
1996	42
1997	44
1998	38
1999	34
2000	40
2001	32
2002	48
2003	46
2004	47
2005	46
2006	47
2007	179
2008	141
2009	152.6
2010	345.4
2011	345.37
2012	450.37
2013	550.4300000000001
2014	952.53
2015	1053
2016	1102
2017	1853
2018	2552.46
2019	2607
2020	2668
2021	1576.3
2022	1915.26