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	2935
1993	2275
1994	1212
1995	1401
1996	1067
1997	1202
1998	1129
1999	815
2000	1710
2001	1709
2002	2335
2003	3408
2004	5650
2005	6300
2006	6800
2007	7500
2008	7800
2009	8200
2010	8800
2011	9000
2012	9080
2013	9080
2014	11080
2015	11246.05
2016	12091.4
2017	12163
2018	12610
2019	12680
2020	12600
2021	12905