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	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	2
2007	2
2008	2
2009	2
2010	2
2011	10.5
2012	10.5
2013	14.5
2014	20.5
2015	20.5
2016	25.5
2017	25.5
2018	25.5
2019	25.5
2020	25.5
2021	20.5
2022	5.5