Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	10
1970	50
1971	50
1972	200
1973	513
1974	1030
1975	1591
1976	2155
1977	3552
1978	4113
1979	5009
1980	9565
1981	12554
1982	22016
1983	36273
1984	34225
1985	30876
1986	44339
1987	70099
1988	75631
1989	71211
1990	77730
1991	107145
1992	116694
1993	87763
1994	89096
1995	106223
1996	108880
1997	134497
1998	145790
1999	126575
2000	61311
2001	57587
2002	77636
2003	95278
2004	108673
2005	138562
2006	169588
2007	171020
2008	173222
2009	219463
2010	272720.8
2011	309702
2012	322655
2013	332382
2014	368492
2015	426750.4
2016	451395.3
2017	485005
2018	581450
2019	695850
2020	774588.55
2021	904136.29
2022	1123048