Year	metric tons
1960	500
1961	600
1962	600
1963	600
1964	600
1965	600
1966	700
1967	700
1968	700
1969	700
1970	900
1971	900
1972	900
1973	900
1974	900
1975	1000
1976	1100
1977	1250
1978	1090
1979	1890
1980	1990
1981	3095
1982	4020
1983	3820
1984	3720
1985	3641
1986	3186
1987	3076
1988	2500
1989	2530
1990	1505
1991	1595
1992	2436
1993	1986
1994	2591
1995	4094
1996	4410
1997	7868
1998	9364
1999	8562
2000	8595
2001	8613
2002	10881
2003	9703
2004	9934
2005	9836
2006	12435
2007	14094
2008	13902
2009	13284
2010	12845
2011	11457
2012	11965.49
2013	11256.73
2014	7558.56
2015	8714.67
2016	8820
2017	10865.12
2018	9756.630000000001
2019	11228.759999999998
2020	9964.17
2021	9186.42
2022	9603.24