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	3059
1993	2365
1994	1330
1995	1529
1996	1093
1997	1228
1998	1148
1999	824
2000	1735
2001	1737
2002	2373
2003	3466
2004	5735
2005	6356
2006	6851
2007	7526
2008	7836
2009	8226
2010	8844
2011	9050
2012	9130
2013	9130
2014	11130
2015	11296.05
2016	12141.4
2017	12213
2018	12660
2019	12730
2020	12650
2021	12905