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	457220
1993	299828
1994	277305
1995	390888
1996	408442
1997	369167
1998	462527
1999	408881
2000	391867
2001	310978
2002	265746
2003	257628
2004	222272.01
2005	268007
2006	219228
2007	215400
2008	234079
2009	220718
2010	209948
2011	179984
2012	154392
2013	203668.7
2014	143083.06
2015	120486.15
2016	75858.84
2017	93481.88
2018	76506.98
2019	81730.63
2020	69467.1
2021	63048.32
2022	22720.93