Year	metric tons
1961	3695000
1962	3696000
1963	3378000
1964	3732000
1965	3785000
1966	3489000
1967	3826000
1968	3916000
1969	4038000
1970	3512000
1971	3319000
1972	3950000
1973	4270000
1974	4351000
1975	4481000
1976	4624000
1977	4147000
1978	4382000
1979	4214000
1980	4072000
1981	3893000
1982	3724000
1983	3591000
1984	3418000
1985	3242000
1986	3084000
1987	3394000
1988	2997000
1989	2834000
1990	2705000
1991	2721302.33
1992	2470000
1993	2981774.06
1994	3144000
1995	3242179.28
1996	3241914.75
1997	3682722.57
1998	3875506.12
1999	3256395.77
2000	1940000
2001	2108000
2002	3737000
2003	4381000
2004	3560000
2005	5425000
2006	4638000
2007	5786000
2008	3950000
2009	6514000
2010	5957000
2011	4681020
2012	6582000
2013	6772235
2014	7012523.28
2015	6010288
2016	5708330.42
2017	5059633.97
2018	4304555.5
2019	5771861
2020	6241828
2021	4970609.31
2022	4824671.6