Year	metric tons
1960	83900
1961	86800
1962	112800
1963	109000
1964	128000
1965	96200
1966	93100
1967	74700
1968	74900
1969	74100
1970	70758
1971	77268
1972	71209
1973	78514
1974	89344
1975	97574
1976	91764
1977	91541
1978	84915
1979	120481
1980	121397
1981	120715.58
1982	131732.64
1983	132306.39
1984	136839.54
1985	174109.77
1986	183653.98
1987	184712.89
1988	232128.79
1989	233105.8
1990	251036
1991	284431
1992	282401.8
1993	302830.7
1994	311601.6
1995	335301.5
1996	340435.4
1997	371333.2
1998	406205
1999	422666
2000	384315
2001	428634
2002	425163
2003	431124
2004	393495
2005	349554
2006	375895
2007	372492
2008	373816
2009	387399
2010	385210
2011	375355
2012	354237.7
2013	356858.09
2014	344792.08
2015	344113
2016	335614.33
2017	370959.67
2018	373286
2019	397043.34
2020	418684
2021	425770
2022	440197