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	11468
1990	12364
1991	11504
1992	13003
1993	9002
1994	14050
1995	11515
1996	9450
1997	11296
1998	14859
1999	14707
2000	14259
2001	16605
2002	18775
2003	14599
2004	14738.5
2005	17021.5
2006	13148.5
2007	13482.3
2008	13845.69
2009	13890.36
2010	13943.5
2011	13119.75
2012	11753.539999999999
2013	13224.57
2014	13295.45
2015	12164.8
2016	13127.04
2017	12949.58
2018	13191.79
2019	12995.71
2020	12916.85
2021	13102.37
2022	13076.41