Year	metric tons
1960	13062284
1961	14012212
1962	14554117
1963	14813632
1964	14984766
1965	16068585
1966	16946818
1967	18149585
1968	19683690
1969	20077244
1970	20898270
1971	22654129
1972	24236925
1973	25281260
1974	26012564
1975	26299279
1976	27171840
1977	28911425.5
1978	29514453
1979	28995301
1980	29913374
1981	31214317.43
1982	32124008.92
1983	33924885.35
1984	35952136.73
1985	36849035.309999995
1986	40099866.96
1987	42121712.730000004
1988	43797275.51
1989	44897028.53
1990	44834183.06
1991	45848595.400000006
1992	49883245.669999994
1993	54140639.96
1994	58465550.519999996
1995	62991657.28
1996	66694347.84
1997	67534132.81
1998	69465015.58
1999	72460960.72
2000	74087792.85000001
2001	75641453.57000001
2002	78290190.36999999
2003	81748993.21000001
2004	85428623.06
2005	88845035.31
2006	92356462.63999999
2007	95991549.97000001
2008	98332673.21999998
2009	101201595.01000002
2010	105050295.35000001
2011	108261923.88
2012	113806242.57999997
2013	120628201.34000002
2014	125650473.66999996
2015	129295893.10000002
2016	131607842.23
2017	134536316.89
2018	136298377.13
2019	137804179.03
2020	138496058.30999997
2021	139808586.23999998
2022	138230416.14000002