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	3401
2000	3621
2001	3561
2002	3720
2003	3850
2004	4000
2005	3650
2006	3300
2007	2911
2008	3243
2009	3200
2010	3200
2011	3200
2012	3200
2013	3580
2014	3880
2015	4180
2016	4580
2017	5380
2018	5997.04
2019	7053.41
2020	6806.24
2021	6525.9
2022	6706.6