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	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	475
1994	2706
1995	3559
1996	3252
1997	1038
1998	1852.9
1999	6997.05
2000	12718
2001	8894
2002	7869
2003	6711
2004	7410
2005	4027
2006	8813
2007	2232
2008	1965
2009	3330
2010	3586
2011	2939
2012	3924.35
2013	3616.68
2014	3695.73
2015	6230.8
2016	3309.13
2017	3932.59
2018	5651.24
2019	5444.4
2020	3744
2021	1493.16
2022	1594.54