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	641
1993	339
1994	560
1995	525
1996	380
1997	345
1998	425
1999	468
2000	325
2001	463
2002	430
2003	637
2004	545
2005	542
2006	565
2007	729
2008	584
2009	517.2
2010	548.8
2011	545.5
2012	574.54
2013	643.21
2014	686.28
2015	862.85
2016	788.09
2017	807.94
2018	829.66
2019	608.64
2020	717.45
2021	901.4
2022	869.91