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	30339
1993	21733
1994	18901
1995	10545
1996	6702
1997	5161
1998	4760
1999	20866
2000	18797
2001	10893
2002	11188
2003	6435
2004	9258
2005	9001
2006	4061
2007	2949
2008	1524
2009	1206
2010	1131
2011	1061
2012	911
2013	857
2014	929
2015	626.2
2016	735
2017	965
2018	1614
2019	1177
2020	2089
2021	1464
2022	1790