Year	metric tons
1960	175911
1961	176822
1962	173016
1963	217937
1964	254341
1965	287757
1966	324613
1967	328215
1968	394282
1969	394942
1970	459628
1971	507249
1972	531014
1973	565133
1974	665636
1975	786442
1976	736485
1977	646861
1978	569398
1979	589349
1980	630783
1981	608898
1982	596400
1983	722833
1984	700369
1985	658198
1986	626401
1987	651648
1988	628026
1989	539440
1990	448292
1991	428627
1992	481775
1993	395406
1994	438032
1995	429372
1996	342793
1997	348913
1998	242010
1999	235724
2000	217682
2001	225064
2002	223440
2003	180399
2004	192108
2005	155247
2006	145479
2007	151820
2008	142496
2009	223893
2010	189722
2011	198308
2012	198385
2013	214170
2014	191598
2015	205428
2016	218115
2017	226396
2018	222704
2019	211443
2020	206390.3
2021	201384.5
2022	178522.94