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	4419
1990	5452
1991	8162
1992	6713
1993	5278
1994	4633
1995	4203
1996	4985
1997	14627
1998	24535
1999	34450
2000	33203
2001	53873
2002	63617
2003	87104
2004	101846
2005	109452
2006	93443
2007	65882
2008	69488
2009	81114
2010	87111
2011	75481
2012	68687.04
2013	73909.63
2014	75377.17000000001
2015	105355.17000000001
2016	127547.76
2017	142653.18
2018	146623.48
2019	142169.39
2020	139647.59
2021	144232.35
2022	137838.33