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	868
1993	718
1994	787
1995	789
1996	869
1997	917
1998	909
1999	1206
2000	1181
2001	1262
2002	1289
2003	1353
2004	1571
2005	1346
2006	1369
2007	1352
2008	1315
2009	1306.6
2010	778.4
2011	1396.6
2012	1154.3
2013	1225.7
2014	1396.3
2015	1617.2
2016	1858.7
2017	1750.1
2018	1943.5
2019	2143.9
2020	1672.6
2021	1685.9
2022	1643.7