Year	metric tons
1961	200
1962	220
1963	240
1964	260
1965	280
1966	305
1967	152
1968	2032
1969	1422
1970	1930
1971	2997
1972	1321
1973	1219
1974	1220
1975	1237
1976	3829
1977	6269
1978	7658
1979	10224
1980	14256
1981	13866
1982	10538
1983	9481
1984	7137
1985	5954
1986	6500
1987	0
1988	0
1989	0
1990	2580.92
1991	2588.55
1992	2596.19
1993	2603.83
1994	2611.47
1995	2619.1
1996	2570.13
1997	1932.1
1998	1300
1999	3240
2000	4524
2001	2083
2002	2267
2003	1947
2004	2500
2005	3000
2006	3250
2007	2800
2008	2800
2009	2500
2010	2617.28
2011	2777.46
2012	2750.89
2013	2758.53
2014	2748.21
2015	2738.1
2016	2739.92
2017	2746.61
2018	2754.54
2019	2753.6
2020	2743.23
2021	2748.41
2022	2753.58