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	1
1978	5
1979	15
1980	16
1981	25
1982	30
1983	24
1984	42
1985	53
1986	50
1987	72
1988	73
1989	82
1990	78
1991	86
1992	100
1993	110
1994	142
1995	176
1996	165
1997	118
1998	83
1999	85
2000	87
2001	59
2002	56
2003	33
2004	350
2005	400
2006	443
2007	175
2008	245
2009	437.4
2010	567.5
2011	537.3
2012	512
2013	397.3
2014	777.5
2015	775.99
2016	1021.32
2017	1253.52
2018	2069.6
2019	3251.2
2020	3298
2021	2315.52
2022	1545.3