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	239356
2001	254564
2002	255494
2003	212105
2004	240094
2005	202742
2006	225897
2007	306626
2008	306050
2009	272302
2010	310310
2011	342310
2012	374310
2013	407057
2014	442389
2015	496104
2016	487145
2017	532914
2018	444858
2019	401696
2020	376515
2021	531522
2022	471672