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	843
1993	350
1994	294
1995	392
1996	330
1997	253
1998	247
1999	119
2000	110
2001	324
2002	245
2003	75
2004	27
2005	46
2006	57
2007	121
2008	100
2009	143
2010	379
2011	454.5
2012	387
2013	420
2014	804.93
2015	1099.4
2016	2019.7
2017	2190
2018	2577.7
2019	4320
2020	5120
2021	10322
2022	20729.3