Year	metric tons
1960	2500
1961	2800
1962	2800
1963	3300
1964	2800
1965	2700
1966	3000
1967	3000
1968	3500
1969	3500
1970	2400
1971	2800
1972	3595
1973	3590
1974	3785
1975	3875
1976	3875
1977	3922
1978	3730
1979	3760
1980	3330
1981	3476
1982	3149
1983	3290
1984	3841
1985	4294
1986	4386
1987	4271
1988	3973
1989	3303
1990	3158
1991	3599
1992	2715
1993	1822
1994	1481
1995	1588
1996	1841
1997	1859
1998	1809
1999	1840
2000	1659
2001	1715
2002	1544
2003	1815
2004	1602
2005	1738
2006	1690
2007	1653
2008	2084
2009	2184
2010	2101
2011	2098
2012	2003
2013	2007
2014	1983
2015	2023
2016	1851
2017	1932
2018	1553
2019	1382.34
2020	1485.93
2021	1485.93
2022	1485.93