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	38100
1993	18240
1994	7413
1995	3560
1996	2453
1997	2583
1998	3001
1999	1413
2000	1791
2001	1636
2002	1811
2003	3306
2004	11988
2005	9974
2006	14746
2007	44068
2008	48443
2009	50026
2010	46049
2011	26547
2012	12070
2013	15520
2014	19020
2015	22520
2016	44708.69
2017	137423.38
2018	203523.5
2019	251755.45
2020	207150
2021	197575.05
2022	197788.37