Year	metric tons
1960	1800
1961	2000
1962	2000
1963	2000
1964	2000
1965	2000
1966	2500
1967	2500
1968	2500
1969	2500
1970	3000
1971	3000
1972	3000
1973	3000
1974	3500
1975	3950
1976	4010
1977	4600
1978	5400
1979	4957
1980	4676
1981	5221
1982	4045
1983	3938
1984	3734
1985	4118
1986	4542
1987	3900
1988	4343
1989	4412
1990	5437
1991	8150
1992	6663
1993	5178
1994	4469
1995	4008
1996	4707
1997	14043
1998	23886
1999	34223
2000	32778
2001	53591
2002	63383
2003	86020
2004	100671
2005	108680
2006	92739
2007	65514
2008	69199
2009	81114
2010	87111
2011	75481
2012	68687.04
2013	73909.63
2014	75377.07
2015	105355.07
2016	127547.76
2017	142653.08
2018	146623.48
2019	142169.39
2020	139647.59
2021	144232.35
2022	137838.33