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	1878.8
2007	1492
2008	2294
2009	2226.2
2010	2085.4
2011	2357.6
2012	2201.6
2013	2391.5
2014	2415.4
2015	2299.8
2016	2524
2017	2101.7
2018	2389.8
2019	2350
2020	1701.45
2021	1666
2022	1942