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	4015
2005	3672
2006	3323
2007	3313
2008	3722
2009	3731
2010	4794
2011	3594
2012	3709
2013	4809
2014	4829
2015	4951
2016	5403
2017	6373
2018	6978.04
2019	8071.41
2020	7866.24
2021	7616.9
2022	7831.6