Year	metric tons
1961	4403935
1962	4466325
1963	4507537
1964	5232842
1965	5307655
1966	6823527
1967	6531374
1968	5285685
1969	6080288
1970	6788615
1971	7076215
1972	8152773
1973	7329016
1974	6608375
1975	7706452
1976	8492409
1977	7577645
1978	7491580
1979	8290010
1980	7647576
1981	8449300
1982	9967359
1983	7931689
1984	9249148
1985	5382902
1986	8492188
1987	7275590
1988	7816939
1989	9527371
1990	8125944
1991	8983805.61
1992	6593632.81
1993	5697849.17
1994	6441668.21
1995	6543382
1996	3403520
1997	6187844
1998	5378183
1999	5221441
2000	4388340.55
2001	6076855.95
2002	6770394
2003	3814085
2004	7462821
2005	5839080
2006	5531830
2007	3870212.73
2008	7015582
2009	6243088
2010	7136449
2011	7521107.72
2012	6988023
2013	9153930
2014	9530421
2015	8570299
2016	8752219
2017	9475846
2018	10109850
2019	11130990
2020	8598290
2021	11639300
2022	9790690