Year	metric tons
1960	38000
1961	38800
1962	33400
1963	36100
1964	34000
1965	37581
1966	36933
1967	48566
1968	40892
1969	45997
1970	62809
1971	72252
1972	84289
1973	102068
1974	129453
1975	136624
1976	127197
1977	150701
1978	137676
1979	179087
1980	173606
1981	192013
1982	235653
1983	242644
1984	232449
1985	237637
1986	271126
1987	264371
1988	267618
1989	224810
1990	127734
1991	125003
1992	95381
1993	34919
1994	42651
1995	69105
1996	32159
1997	19614
1998	18675
1999	16841
2000	17099
2001	18427
2002	16228
2003	18932
2004	13232
2005	13337
2006	14751
2007	16495
2008	17942
2009	17151
2010	11669.32
2011	11607.26
2012	13964
2013	15364
2014	16927.98
2015	20348.75
2016	25302.03
2017	27796.2
2018	23477.45
2019	23775.18
2020	20172.88
2021	18064.6
2022	17467.2