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	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	1524.8
2007	1131
2008	1680
2009	1661.2
2010	1345.4
2011	1517.6
2012	1390.6
2013	1580.5
2014	1556.4
2015	1486.8
2016	1595
2017	1079.7
2018	1292.8
2019	1276
2020	816.45
2021	808
2022	855