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	2
1976	4
1977	9
1978	13
1979	19
1980	27
1981	41
1982	58
1983	79
1984	185
1985	106
1986	106
1987	270
1988	399
1989	410
1990	573
1991	1975
1992	2244
1993	3335
1994	3910
1995	6756
1996	6986
1997	7000
1998	7937
1999	9324
2000	9708
2001	10520
2002	17892
2003	20546
2004	24708
2005	24038
2006	19962
2007	25765
2008	27059
2009	24754.3
2010	26839
2011	27713.5
2012	27287
2013	30352
2014	26765.5
2015	23559.5
2016	22212
2017	21124
2018	21955
2019	22046
2020	16268.95
2021	17309.4
2022	16772.41