Year	metric tons
1960	1600
1961	1600
1962	1500
1963	2000
1964	2500
1965	3500
1966	4000
1967	5900
1968	4900
1969	4000
1970	5181
1971	4153
1972	4078
1973	8333
1974	3428
1975	3900
1976	3800
1977	6000
1978	7000
1979	7476
1980	8837
1981	14730
1982	12453
1983	11863
1984	10730
1985	10190
1986	7335
1987	7312
1988	6387
1989	8614
1990	6579.04
1991	7378.1
1992	6573
1993	7000
1994	8256
1995	8495
1996	9255
1997	9705
1998	9424
1999	10360
2000	10586
2001	8676
2002	8851
2003	8136
2004	11031
2005	21931
2006	19826
2007	20127
2008	21119
2009	19213
2010	21412
2011	23077
2012	20943.45
2013	35983.8
2014	35677.41
2015	39393.28
2016	27938.73
2017	18617
2018	26593.23
2019	17195.32
2020	19507.25
2021	11651.87
2022	7793.94