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	13
1999	0
2000	0
2001	0
2002	0
2003	352
2004	515.4
2005	218
2006	114
2007	96
2008	121
2009	118.4
2010	127
2011	157
2012	168
2013	353
2014	282.4
2015	170
2016	103
2017	77.25
2018	451.45
2019	1054
2020	1307
2021	1703
2022	3468