Year	metric tons
1960	1400
1961	1400
1962	1400
1963	1500
1964	1500
1965	1800
1966	1800
1967	1800
1968	1800
1969	1800
1970	2100
1971	2200
1972	2300
1973	2400
1974	2510
1975	2610
1976	2710
1977	2816
1978	2825
1979	2819
1980	2937
1981	2715
1982	2715
1983	2542
1984	2956
1985	8196
1986	16888
1987	20078
1988	25886
1989	27200
1990	41975
1991	44367
1992	45019
1993	40755
1994	47357
1995	57904
1996	47696
1997	70357
1998	75019
1999	91433
2000	70589
2001	36176
2002	44968
2003	113867
2004	212786.63
2005	229553
2006	222561
2007	213697.2
2008	172595
2009	150544.3
2010	101244.5
2011	59315.5
2012	67482.59
2013	70636.58
2014	70707.26
2015	83013
2016	46641.1
2017	34497
2018	43374.56
2019	57184.39
2020	63665.49
2021	69872.54
2022	88117.33