Year	metric tons
1961	10612300
1962	9677400
1963	10436000
1964	11106700
1965	12601312
1966	13899300
1967	13511667
1968	12770349
1969	12823540
1970	10631666
1971	14529700
1972	16912500
1973	13810300
1974	13550200
1975	15265815
1976	19791000
1977	18614036
1978	18313459
1979	18586967
1980	19366677
1981	16372668
1982	19954166
1983	17665584
1984	20044700
1985	19502800
1986	19725200
1987	16889500
1988	19286400
1989	18379030
1990	17173554
1991	19306621
1992	12288452
1993	15493054
1994	18183777
1995	19882827
1996	14199688
1997	22107324
1998	15452719
1999	17037346
2000	10477506
2001	18870926
2002	14356504
2003	12964404
2004	24399681
2005	19347775.46
2006	15759324
2007	7814825
2008	16826441
2009	14872952
2010	16712883
2011	20842160
2012	12824138
2013	20897076
2014	22070736
2015	19332821
2016	21764816
2017	27138884
2018	31552790
2019	30411970
2020	18153430
2021	27791090
2022	18860480