Year	metric tons
1960	257300
1961	246800
1962	274800
1963	245300
1964	362000
1965	263300
1966	335300
1967	299300
1968	303100
1969	425200
1970	374501
1971	324322
1972	606656
1973	478659
1974	399784
1975	160581
1976	81542
1977	120407
1978	125630
1979	113072
1980	85085
1981	130957
1982	111488
1983	110376
1984	95188
1985	100093
1986	84660
1987	107490
1988	126031
1989	137465
1990	133088
1991	117104
1992	113625
1993	126200
1994	132413
1995	122781
1996	137815
1997	146304
1998	163149
1999	175799
2000	239351
2001	254553
2002	255443
2003	212033
2004	240002
2005	202616
2006	225741
2007	306436
2008	305860
2009	272042
2010	310000
2011	342000
2012	374000
2013	407000
2014	442084
2015	495232
2016	486490
2017	531575
2018	443066
2019	399762
2020	374453
2021	528714
2022	469336