Year	metric tons
1961	346400451
1962	370468891
1963	386746501
1964	376002110
1965	405800875
1966	418337235
1967	445449379
1968	457451904
1969	457726878
1970	417470966
1971	506238259
1972	494590135
1973	512513541
1974	484185990
1975	524696512
1976	537939933
1977	551987000
1978	593442612
1979	599578785
1980	576372851
1981	643480009
1982	658956478
1983	535848354
1984	683520329
1985	702798550
1986	672901805
1987	624844860
1988	547119085
1989	642546302
1990	674943367.0799999
1991	651209228
1992	688428369.0300001
1993	611980006.64
1994	711555344.83
1995	629161435.9000001
1996	731284200.58
1997	743879594.9600002
1998	748589717.5999999
1999	727562070.23
2000	738074679.79
2001	718537336.5100001
2002	690831427.6599998
2003	697220217.6199999
2004	837635510.8699998
2005	771260351.12
2006	728161251.0400001
2007	775059932.68
2008	832480674.5699999
2009	831278687.96
2010	790397361.86
2011	793954539.0999999
2012	762770257.0199999
2013	869667701.58
2014	891550874.43
2015	866862354.99
2016	924912668.8499999
2017	882219587.3999997
2018	848216078.6800001
2019	857614671.86
2020	852634474.4499998
2021	890426719.15
2022	848953703.02