Year	metric tons
1960	2800
1961	1000
1962	2600
1963	1900
1964	1900
1965	2400
1966	2300
1967	1800
1968	1800
1969	1300
1970	1400
1971	1900
1972	2900
1973	2700
1974	2538
1975	2071
1976	2658
1977	1403
1978	1838
1979	2783
1980	3220
1981	2998
1982	6533
1983	9720
1984	10945
1985	11835
1986	16977
1987	19366
1988	27751
1989	26985
1990	28600
1991	48700
1992	51500
1993	52501
1994	51256
1995	70391
1996	74800
1997	76850
1998	93807
1999	91650
2000	85640
2001	76024
2002	86583
2003	84641
2004	92220
2005	105302
2006	107524
2007	111908
2008	112358
2009	104958
2010	110592
2011	117266
2012	100161
2013	97123
2014	109873.85
2015	91275.3
2016	109016.2
2017	116530
2018	104549
2019	114582
2020	118582
2021	116839
2022	106152