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	693
1993	330
1994	417
1995	315
1996	272
1997	260
1998	260
1999	200
2000	225
2001	467
2002	257
2003	372
2004	252
2005	555
2006	703
2007	772
2008	813
2009	653.6
2010	573.04
2011	388.34
2012	581.4
2013	733.21
2014	870.47
2015	798.7
2016	867.73
2017	870.46
2018	943.66
2019	1061.97
2020	1090.15
2021	849.45
2022	800.81