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	1094
1993	916
1994	940
1995	1037
1996	604
1997	668
1998	783
1999	1305
2000	1425
2001	915
2002	911
2003	1026
2004	1172
2005	1114
2006	735
2007	1218
2008	1453
2009	1762
2010	1727
2011	1636
2012	1555
2013	1674
2014	1496
2015	1341
2016	1108
2017	1595.4
2018	1499.3
2019	2355
2020	2106.79
2021	2174.51
2022	2261.2