Year	metric tons
1960	303400
1961	346100
1962	321200
1963	361000
1964	388100
1965	377200
1966	353000
1967	314500
1968	323300
1969	323200
1970	300800
1971	321200
1972	348300
1973	343736
1974	325861
1975	350558
1976	284999
1977	313094
1978	324486
1979	323773
1980	340512
1981	479772
1982	544867
1983	561989
1984	496061
1985	554911
1986	502877
1987	511773
1988	476409
1989	530228
1990	507239
1991	458814
1992	487076
1993	532882
1994	529431
1995	522031
1996	510669
1997	550010
1998	656719
1999	623371
2000	571005
2001	575205
2002	518465
2003	592821
2004	600234
2005	626976
2006	558632
2007	544433
2008	487286.7
2009	442682.6
2010	501459.1
2011	413983.97000000003
2012	393488.4
2013	374057
2014	434451
2015	447120
2016	432284
2017	551818
2018	465199
2019	366791.8
2020	347466.11
2021	340231
2022	338052