Year	metric tons
1960	77000
1961	75000
1962	77000
1963	69500
1964	75000
1965	81000
1966	84000
1967	93400
1968	127700
1969	149300
1970	136600
1971	123900
1972	124200
1973	156900
1974	128810
1975	113380
1976	117858
1977	107000
1978	108706
1979	115182
1980	102415
1981	102640
1982	100700
1983	102000
1984	148219
1985	148276
1986	155825
1987	161577
1988	161841
1989	166240
1990	162700
1991	165850
1992	187840
1993	196789
1994	155897
1995	158627
1996	163010
1997	162211
1998	178041
1999	208448
2000	244619
2001	231378
2002	237690
2003	234375
2004	235752
2005	234814
2006	234562
2007	234252
2008	231447
2009	228363
2010	224491
2011	221250
2012	218000
2013	227414
2014	229612
2015	230726
2016	237372
2017	238000
2018	238000
2019	238000
2020	217750
2021	228665