Year	metric tons
1960	2400
1961	2400
1962	2400
1963	2400
1964	2400
1965	3000
1966	3000
1967	3200
1968	3400
1969	3400
1970	3600
1971	4100
1972	3700
1973	4000
1974	3725
1975	4417
1976	4417
1977	4303
1978	4823
1979	3840
1980	4461
1981	3804
1982	4574
1983	4541
1984	3764
1985	5560
1986	4347
1987	7714
1988	9211
1989	11466
1990	12362
1991	11501
1992	13000
1993	8998
1994	14046
1995	11500
1996	9435
1997	11283
1998	14846
1999	14694
2000	14237
2001	16598
2002	18768
2003	14592
2004	14713
2005	16996
2006	13123
2007	13463
2008	13833
2009	13863
2010	13930
2011	13114
2012	11746.99
2013	13217.02
2014	13290
2015	12141
2016	13115.94
2017	12942.13
2018	13184.34
2019	12941.71
2020	12912.65
2021	13084.17
2022	13069.01