Year	metric tons
1961	466000
1962	472500
1963	478000
1964	485000
1965	493000
1966	497000
1967	511000
1968	486000
1969	534000
1970	530000
1971	544000
1972	564000
1973	457477
1974	458400
1975	422500
1976	446000
1977	369587
1978	374504
1979	428729
1980	419670
1981	409250
1982	390900
1983	428180
1984	432058
1985	444655
1986	475915
1987	461806
1988	469183
1989	453100
1990	360900
1991	400000
1992	451796
1993	422377.1
1994	425000
1995	412795.71
1996	412198
1997	490000
1998	402596
1999	475000
2000	430500
2001	363000
2002	376000
2003	381500
2004	398000
2005	405500
2006	415000
2007	520000
2008	420000
2009	553500
2010	626800
2011	616092.22
2012	441594.05
2013	613317.95
2014	586897
2015	428590.12
2016	442632
2017	484000
2018	415370
2019	389868
2020	300130
2021	373000
2022	340000