Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	50
1966	190
1967	390
1968	600
1969	800
1970	999
1971	1201
1972	1403
1973	1200
1974	1800
1975	1800
1976	2500
1977	2500
1978	3455
1979	3275
1980	4921
1981	5698
1982	6334
1983	7746
1984	9586
1985	10166
1986	11006
1987	12689
1988	16367
1989	18550
1990	18550
1991	19271
1992	17909
1993	17526
1994	16682
1995	17345
1996	17659
1997	16426
1998	16024
1999	15449
2000	15400
2001	15739
2002	15132
2003	12558
2004	12821
2005	14355
2006	12891
2007	13025
2008	13439
2009	13627
2010	11772
2011	11275
2012	12659
2013	13613
2014	13465
2015	14877
2016	14412.17
2017	14586.9
2018	14163.7
2019	15295.8
2020	15052.9
2021	14399.4
2022	16280.6