Year	metric tons
1961	16123000
1962	14045000
1963	15178000
1964	14092000
1965	16162000
1966	15795100
1967	16265600
1968	17946200
1969	18574200
1970	16262100
1971	19870600
1972	20402800
1973	21859200
1974	22977400
1975	19557653
1976	20863240
1977	19399014
1978	21536633
1979	17340564
1980	18336070
1981	19720795
1982	21166289
1983	22098776
1984	24392409
1985	23741480
1986	25035598
1987	26059921
1988	24504330
1989	26957819
1990	28013511
1991	27811536
1992	19962168
1993	23417080
1994	21763445
1995	25905314
1996	25297819
1997	25399486
1998	27158723
1999	25750319
2000	22340612
2001	26960313
2002	26877272
2003	23390757
2004	29635147
2005	26927924
2006	21775931
2007	27142811
2008	27664297
2009	29826416
2010	27228098
2011	26767403
2012	28543870
2013	28455154
2014	31945433
2015	28002726
2016	29849223
2017	31924964
2018	26281580
2019	28450920
2020	35031300
2021	33996290
2022	34987760