Year	metric tons
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	161
1972	218
1973	207
1974	236
1975	261
1976	446
1977	370
1978	465
1979	530
1980	640
1981	735
1982	1368
1983	871
1984	1127
1985	1539
1986	1977
1987	3020
1988	3224
1989	3297
1990	3135
1991	3749
1992	3872
1993	5368
1994	3940
1995	4256
1996	5195
1997	5768
1998	5750
1999	7102
2000	7215
2001	6584
2002	6466.77
2003	7083
2004	5490
2005	7094
2006	6740
2007	5002
2008	3150
2009	2219.6
2010	2665
2011	1700
2012	1908
2013	2259
2014	2455
2015	1800.5
2016	1377.3
2017	1374
2018	2308
2019	1011
2020	1503.3
2021	3305
2022	2642.85