Year	metric tons
1961	1380
1962	1380
1963	1380
1964	1680
1965	1380
1966	1480
1967	1080
1968	1066
1969	1087
1970	1280
1971	1100
1972	1130
1973	1147
1974	1097
1975	1068
1976	736
1977	627
1978	1241
1979	1790
1980	3225
1981	3005
1982	3050
1983	2349
1984	1224
1985	2495
1986	1947
1987	692
1988	999
1989	792
1990	1244
1991	690
1992	808
1993	450
1994	497
1995	1018
1996	1894
1997	1878
1998	2029
1999	2219
2000	4795
2001	4726
2002	3994
2003	6084
2004	5312
2005	6290
2006	3956
2007	5781
2008	4203
2009	2664
2010	3335
2011	2597
2012	4198
2013	4386
2014	4815
2015	7074.58
2016	8782.7
2017	9590.73
2018	10308.7
2019	8951
2020	10124.6
2021	7501.5
2022	4247