Year	metric tons
1961	173900
1962	185530
1963	219642
1964	227500
1965	237487
1966	302968
1967	247238
1968	245000
1969	234000
1970	322580
1971	347790
1972	283040
1973	279204
1974	245207
1975	265210
1976	233970
1977	258250
1978	270183
1979	315228
1980	295620
1981	290838
1982	308260
1983	291452
1984	439756
1985	370644
1986	366002
1987	368225
1988	503770
1989	565807
1990	483958
1991	464877
1992	494785
1993	633126
1994	572507
1995	591264
1996	686596
1997	748221
1998	624267
1999	759376
2000	740520
2001	814714
2002	801479
2003	807299
2004	799023
2005	833289
2006	885517
2007	877647
2008	935210
2009	1061456
2010	1045866
2011	1057893
2012	1268350
2013	1306625
2014	1310851
2015	1249728
2016	1263762
2017	1301069
2018	1339107
2019	1372361
2020	1355508
2021	1403574
2022	1439850