Year	metric tons
1961	4964
1962	5080
1963	5503
1964	5021
1965	5025
1966	4681
1967	4786
1968	3666
1969	3653
1970	3518
1971	3963
1972	4156
1973	3734
1974	3549
1975	4354
1976	5441
1977	6135
1978	5543
1979	6473
1980	7690
1981	8933
1982	11757
1983	11554
1984	9130
1985	9130
1986	8930
1987	8735
1988	8738
1989	8515
1990	8901
1991	6900
1992	7200
1993	7300
1994	7300
1995	7400
1996	7000
1997	10543
1998	10700
1999	10789.97
2000	11714
2001	11800
2002	12000
2003	11800
2004	12251.94
2005	12433.29
2006	12500
2007	14200
2008	16500
2009	15900
2010	15168.95
2011	14596.93
2012	14271.79
2013	13974.29
2014	13707.26
2015	12180.12
2016	12758.28
2017	14587.02
2018	0
2019	0
2020	0
2021	0
2022	0