Year	metric tons
1960	3502700
1961	5216500
1962	6884300
1963	6822000
1964	9037700
1965	7385400
1966	8712500
1967	10057700
1968	10444405
1969	9147515
1970	12484240
1971	10507154
1972	4678399
1973	2295861
1974	4126080
1975	3415487
1976	4343785
1977	2503892
1978	3443705
1979	3653017
1980	2709923
1981	2718481
1982	3515081
1983	1570508
1984	3320188
1985	4138458
1986	5616763
1987	4587842
1988	6642111
1989	6854349
1990	6874400
1991	6905099
1992	7508289
1993	9009882
1994	12005290
1995	8943526
1996	9523079
1997	7877802
1998	4353248
1999	8437389
2000	10665173
2001	7999263
2002	8782897
2003	6107545
2004	9634059
2005	9419469
2006	7049318
2007	7260861
2008	7451437
2009	6977772
2010	4394996
2011	8347157.35
2012	4925052.85
2013	6002185.89
2014	3714324.42
2015	4934836.46
2016	3928938.15
2017	4285651.36
2018	7349861.86
2019	5014100.01
2020	5820795.2
2021	6726988.609999999
2022	5509031.32