Year	metric tons
1960	5213
1961	4613
1962	4713
1963	2813
1964	2113
1965	2613
1966	4813
1967	4613
1968	3213
1969	3013
1970	2313
1971	2313
1972	2313
1973	2613
1974	2668
1975	4223
1976	4952
1977	3188
1978	3597
1979	4267
1980	3747
1981	3423
1982	3492
1983	6534
1984	5784
1985	3832
1986	4112
1987	3610
1988	8939
1989	2585
1990	3029
1991	2292
1992	3585
1993	3225
1994	2829
1995	3592
1996	3523
1997	2820
1998	3655
1999	3281
2000	3185
2001	2731
2002	2530
2003	2849
2004	2159
2005	2193
2006	1988
2007	2237
2008	3564
2009	3509
2010	3282
2011	1828.39
2012	1371.13
2013	2990.36
2014	2226.82
2015	1519.45
2016	1760.98
2017	1765.04
2018	1757.46
2019	900.24
2020	1059.25
2021	867.07
2022	857.04