Year	metric tons
1960	958506
1961	777762
1962	741121
1963	856931
1964	1017083
1965	1159540
1966	1320775
1967	1315911
1968	1306208
1969	1513849
1970	1480670
1971	1790968
1972	1987611
1973	1823366
1974	1975622
1975	2157727
1976	2106125
1977	2788044
1978	2987334
1979	2901626
1980	3105342
1981	3033775
1982	3258008
1983	3657489
1984	4271240
1985	5026016
1986	5606227
1987	6325967
1988	7376299
1989	8101298
1990	8392965
1991	9695110
1992	12185159
1993	15221669
1994	18213586
1995	21152498
1996	23465787
1997	23747399
1998	25671893
1999	28000956
2000	29749708
2001	31102502
2002	33160273
2003	34891716
2004	37172411
2005	38943267
2006	40911091.49
2007	42530160.3
2008	44072886.73
2009	46062875.71
2010	47789756.78
2011	49147606.1
2012	52082585.66
2013	55029057.76
2014	57320503.73
2015	59368941.59
2016	62318377.86
2017	64358480.81
2018	66135059.34
2019	68423858.99
2020	70483538.48
2021	72805297
2022	75388639