Year	metric tons
1961	124400
1962	327400
1963	322200
1964	371000
1965	323200
1966	264000
1967	332100
1968	215700
1969	131600
1970	284800
1971	372900
1972	205000
1973	455400
1974	315800
1975	482400
1976	374100
1977	412600
1978	354300
1979	330300
1980	286800
1981	342700
1982	550600
1983	812800
1984	596700
1985	884000
1986	869400
1987	689210
1988	814273
1989	839200
1990	718338
1991	595000
1992	493900
1993	478822.5
1994	333592.48
1995	262712.91
1996	221409.73
1997	241690.58
1998	195900
1999	170706.49
2000	143309
2001	143412.52
2002	127175.19
2003	166479.53
2004	139798.06
2005	77837.65
2006	138572
2007	114777
2008	212893
2009	391659
2010	355062
2011	446050
2012	479349
2013	387043
2014	525473
2015	219068
2016	483453.4
2017	238101.9
2018	453849.21
2019	433305.44
2020	430317.92
2021	614497.24
2022	428648.86