Year	metric tons
1960	24300
1961	24400
1962	19700
1963	22600
1964	19990
1965	23731
1966	22633
1967	30666
1968	26492
1969	30597
1970	43959
1971	50252
1972	55579
1973	74218
1974	95909
1975	104308
1976	89824
1977	115559
1978	102346
1979	144536
1980	138930
1981	152997
1982	191992
1983	210427
1984	187333
1985	195223
1986	223582
1987	224188
1988	216938
1989	177550
1990	92784
1991	95473
1992	70761
1993	13819
1994	22251
1995	49275
1996	18259
1997	8446
1998	9061
1999	7843
2000	7372
2001	7609
2002	6980
2003	9890
2004	5095
2005	6053
2006	6663
2007	6183
2008	5410
2009	4020
2010	2688
2011	3254
2012	3960
2013	5218
2014	6248
2015	9307
2016	12728
2017	14998
2018	11179
2019	10927.4
2020	7972.88
2021	6350.6
2022	6256.42