Year	metric tons
1960	249542
1961	268413
1962	293900
1963	341800
1964	377298
1965	370056
1966	319790
1967	341168
1968	318460
1969	269358
1970	285669
1971	229386
1972	218105
1973	220184
1974	205148
1975	206862
1976	204810
1977	182316
1978	184937
1979	197481
1980	232694
1981	254718
1982	251842
1983	258490
1984	271353
1985	236637
1986	210963
1987	207124
1988	242676
1989	249783
1990	250982
1991	237017
1992	307545
1993	341897
1994	386814
1995	404573
1996	370898
1997	357383
1998	410887
1999	351256
2000	338534
2001	311817
2002	294964
2003	286875
2004	269930
2005	256359
2006	269251
2007	238253
2008	231336
2009	203415
2010	212035
2011	181321
2012	151609
2013	188951
2014	181574
2015	211963
2016	205465
2017	228726
2018	221662
2019	184337
2020	179642.8
2021	167366.32
2022	152028.08