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	5
1990	10
1991	10
1992	16
1993	22
1994	22
1995	26
1996	28
1997	30
1998	30
1999	30
2000	32
2001	24
2002	40
2003	42
2004	45
2005	45
2006	45
2007	48
2008	50
2009	45
2010	45
2011	45
2012	50
2013	50
2014	52
2015	52
2016	52
2017	52
2018	52
2019	57
2020	67
2021	75
2022	79