Year	metric tons
1961	297619
1962	348855
1963	364887
1964	406627
1965	433450
1966	465000
1967	496450
1968	453550
1969	532110
1970	473923
1971	487650
1972	502800
1973	503200
1974	543450
1975	595650
1976	613350
1977	634900
1978	654900
1979	533000
1980	551100
1981	542100
1982	567650
1983	514350
1984	561237
1985	488150
1986	577406
1987	517225
1988	547000
1989	574100
1990	563100
1991	559700
1992	534215
1993	542425
1994	466400
1995	407600
1996	444300
1997	466800
1998	373010
1999	279832
2000	222472
2001	334600
2002	466479
2003	496093
2004	614202.16
2005	824691
2006	1158933
2007	656252
2008	758302.42
2009	976872.86
2010	1144650.03
2011	1257898.55
2012	1258510.8
2013	1374083.92
2014	1304449.47
2015	987059.65
2016	984599
2017	1025500.63
2018	1038913.14
2019	1084134.26
2020	1170410.67
2021	2131540.17
2022	1535047.43