Year	metric tons
1961	1376218
1962	1520717
1963	1711045
1964	1718408
1965	1794258
1966	1617546
1967	2005760
1968	2330767
1969	2324274
1970	2089966
1971	2007843
1972	2214950
1973	2445860
1974	2541882
1975	2627749
1976	3236349
1977	3177352
1978	2778901
1979	2377734
1980	2231089
1981	2229399
1982	2946815
1983	2713320
1984	1739552
1985	2915624
1986	3385292
1987	2896914
1988	3300425
1989	3160756
1990	2788475
1991	2923992
1992	2997899
1993	2539301
1994	3624079
1995	3229877
1996	2669157
1997	2700368
1998	2927285
1999	2802247
2000	2591351
2001	3369648.3
2002	3045518
2003	3351497
2004	3199022
2005	3585080
2006	3936250.35
2007	3613833.84
2008	2866110.72
2009	2898883.86
2010	4347437
2011	4058581
2012	4711585
2013	4536942
2014	4227112.63
2015	4523082.62
2016	3892022.42
2017	3711200.84
2018	4805995.66
2019	4621285.63
2020	4881292.56
2021	3969178.4
2022	3753772.6