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	8
1982	9
1983	12
1984	61
1985	459
1986	528
1987	651
1988	920
1989	713
1990	904
1991	831
1992	1235
1993	3286
1994	4393
1995	3675
1996	3421
1997	4407
1998	3124
1999	4850
2000	3963
2001	5100
2002	7978
2003	6346
2004	4908
2005	9008
2006	16293
2007	16400
2008	18727
2009	16623
2010	22792.23
2011	21468
2012	17743
2013	19762
2014	21395
2015	22247.6
2016	23448.9
2017	26360
2018	28317
2019	31000
2020	33651
2021	32583.45
2022	42313.4