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	4
1996	3
1997	0
1998	1
1999	3
2000	12
2001	0
2002	3
2003	4
2004	8
2005	3
2006	2
2007	1
2008	2
2009	2
2010	3.19
2011	3.42
2012	1.72
2013	0
2014	5.7
2015	6
2016	14.21
2017	21
2018	21
2019	36
2020	46
2021	51
2022	56