Year	metric tons
1960	31200
1961	30600
1962	35000
1963	35612
1964	37165
1965	41080
1966	43826
1967	65975
1968	66250
1969	78919
1970	104500
1971	127110
1972	139711
1973	150387
1974	164629
1975	144053
1976	194490
1977	184759
1978	213176
1979	153701
1980	186450
1981	164834
1982	195296
1983	198494
1984	199858.3
1985	219862.9
1986	244558.3
1987	214773.6
1988	231091.1
1989	191882.9
1990	188067.8
1991	171061.6
1992	111943.8
1993	97708.3
1994	93974.4
1995	102342.2
1996	120560.8
1997	113168.5
1998	98341.1
1999	100811.1
2000	101266
2001	80277
2002	59630
2003	60985
2004	59756
2005	50869
2006	54797
2007	67011
2008	65399
2009	64894
2010	55418
2011	48703.8
2012	48499.2
2013	51680.7
2014	56338.6
2015	57690
2016	52759
2017	52758
2018	51249
2019	45468.3
2020	46096.2
2021	40717.399999999994
2022	29923.9