Year	metric tons
1960	4200
1961	3700
1962	4000
1963	4000
1964	4000
1965	4500
1966	5000
1967	6000
1968	6000
1969	7000
1970	8000
1971	8200
1972	8900
1973	9300
1974	10064
1975	10046
1976	10132
1977	10190
1978	10812
1979	13484
1980	11791
1981	13004
1982	13588
1983	15286
1984	14657
1985	11486
1986	16059
1987	18734
1988	16076
1989	14805
1990	6463
1991	9620
1992	8891
1993	7782
1994	7721
1995	8829
1996	7408
1997	8491
1998	10717
1999	14702
2000	11540
2001	10510
2002	11072
2003	10494
2004	13762
2005	12192
2006	8944
2007	14548
2008	7950
2009	10770
2010	11780
2011	13511.05
2012	14128.69
2013	15220.98
2014	14597.19
2015	14239.22
2016	14063.1
2017	12489.1
2018	14807.29
2019	16989.03
2020	32691.68
2021	26319.14
2022	30712.99