Year	metric tons
1960	6300
1961	8000
1962	56600
1963	64200
1964	65200
1965	66900
1966	65300
1967	52000
1968	69700
1969	95800
1970	156200
1971	146700
1972	164300
1973	166900
1974	173927
1975	168312
1976	186900
1977	193768
1978	235500
1979	206760
1980	205638
1981	215150
1982	225730
1983	229310
1984	247426
1985	266608
1986	268449
1987	270734
1988	271403
1989	222924
1990	203766
1991	224971
1992	171259
1993	128330
1994	181940
1995	225965
1996	233633
1997	241169
1998	315908
1999	320469
2000	311429
2001	311591
2002	257249
2003	271279
2004	301981
2005	225029
2006	297891.2
2007	287985.4
2008	255291.24
2009	271567.37
2010	256785.65
2011	277253.83
2012	269595.67
2013	229307.64
2014	288009.88
2015	296571.97
2016	290484.09
2017	318143
2018	356903.01
2019	311041.81
2020	276626.84
2021	279912.02
2022	276070.81