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	156747
1993	141974
1994	138105
1995	149194
1996	142644
1997	105682
1998	102331
1999	125389
2000	136403
2001	128176
2002	117553
2003	114543
2004	125391
2005	150618
2006	140389
2007	155276
2008	157934
2009	163213
2010	164819
2011	154310
2012	94404
2013	116029
2014	119536
2015	81340
2016	114278
2017	69411.6
2018	73144
2019	71385
2020	64989
2021	61658.11
2022	61508