Year	metric tons
1960	1899922
1961	2069554
1962	2219186
1963	2347934
1964	2607463
1965	2682402
1966	2859479
1967	3225596
1968	3711837
1969	3695420
1970	3165705
1971	3234315
1972	3591634
1973	3733489
1974	3729445
1975	3474876
1976	3171021
1977	3106170
1978	3145079
1979	3060910
1980	2856482
1981	2945882
1982	2927885
1983	3134536
1984	3001460
1985	3027924
1986	3258248
1987	4034662
1988	3921977
1989	3569548
1990	3652346.04
1991	3416823.1
1992	4277441
1993	4186893
1994	3957763
1995	4132562.74
1996	4139943.95
1997	4297895.66
1998	4504384.48
1999	4716437.9399999995
2000	4919340.91
2001	5000466.82
2002	5029388.83
2003	5329969.5
2004	5601392.97
2005	5554388.390000001
2006	5159727.49
2007	5246552.51
2008	5330196.640000001
2009	5325879
2010	5671202.64
2011	5929796.2299999995
2012	6334863.109999999
2013	6198975.29
2014	6496453.63
2015	6570193.609999999
2016	6983525.949999999
2017	7735947.840000001
2018	7819272.340000001
2019	7551543.840000001
2020	7335958.079999999
2021	7801351.079999999
2022	7611929.130000001