Year	metric tons
1960	31200
1961	30600
1962	35000
1963	35612
1964	37165
1965	41080
1966	43826
1967	65955
1968	66170
1969	78699
1970	104150
1971	126650
1972	139141
1973	149707
1974	163819
1975	143013
1976	193180
1977	183439
1978	211486
1979	151711
1980	184141
1981	161857
1982	191517
1983	194349
1984	195475.3
1985	215225.9
1986	239932.3
1987	209195.6
1988	225323.1
1989	185846.9
1990	179893.8
1991	162800.6
1992	100966.8
1993	84934.3
1994	77701.4
1995	80066.2
1996	84206.8
1997	76801.5
1998	58738.1
1999	60645.1
2000	68486
2001	54708
2002	32586
2003	34088
2004	32194
2005	28234
2006	27587
2007	29485
2008	28714
2009	28892
2010	23996
2011	24106
2012	22320
2013	22103
2014	25056
2015	25634
2016	23574
2017	21548
2018	22621
2019	18546.1
2020	20186.2
2021	18052.8
2022	14534.5