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	16
1984	51
1985	87
1986	59
1987	88
1988	218
1989	389
1990	631
1991	754
1992	847
1993	717
1994	780
1995	939
1996	1061
1997	1152
1998	1596
1999	1850
2000	1765
2001	1893
2002	1918
2003	1784
2004	2290
2005	2533
2006	2365
2007	1923
2008	2106
2009	1923
2010	1223
2011	1564
2012	1666
2013	1596
2014	1659
2015	1256
2016	1588.25
2017	1458.5
2018	1617.3
2019	1491.89
2020	1477.88
2021	1436.52
2022	1456