Year	metric tons
1960	1874690
1961	2042120
1962	2190890
1963	2319944
1964	2579406
1965	2652288
1966	2827162
1967	3189556
1968	3669073
1969	3646837
1970	3109317
1971	3167756
1972	3547562
1973	3692280
1974	3676734
1975	3426649
1976	3125049
1977	3053343
1978	3088960
1979	3018961
1980	2814128
1981	2869853
1982	2855774
1983	3033547
1984	2916085
1985	2938359
1986	3155378
1987	3920273
1988	3821933
1989	3486174
1990	3567938.04
1991	3355020.1
1992	4217304
1993	4129198
1994	3908653
1995	4096372.74
1996	4110107.95
1997	4248877.66
1998	4425448.48
1999	4617436.9399999995
2000	4837811.91
2001	4900639.82
2002	4952522.83
2003	5171043.5
2004	5342407.97
2005	5279042.54
2006	5096135.19
2007	5179909.71
2008	5366273.49
2009	5335279.949999999
2010	5701567.979999999
2011	5947431.860000001
2012	6374952.46
2013	6285381.66
2014	6708435.98
2015	6784433.98
2016	6908804.1
2017	7461425.159999999
2018	7379273.58
2019	7347228.17
2020	7188579.28
2021	7654742.32
2022	7482151.19