Year	metric tons
1961	1015200
1962	1031678
1963	1377714
1964	1132828
1965	1122892
1966	1346427
1967	1160095
1968	985114
1969	1086208
1970	1003094
1971	1229561
1972	1200069
1973	1572340
1974	1376313
1975	2138000
1976	2386000
1977	2639000
1978	2750909
1979	3227050
1980	2960500
1981	2843000
1982	3006500
1983	2873831
1984	3142085
1985	3622492
1986	3778232
1987	4034615
1988	3664265
1989	4785811
1990	3960300
1991	3857815
1992	3538050
1993	3916590
1994	2952900
1995	4654287.42
1996	4873811.46
1997	3364446.14
1998	4466774.34
1999	4009929.33
2000	3622945.07
2001	4537267.3
2002	6371183.5
2003	4109738.38
2004	6706622
2005	5394302
2006	5745560
2007	6402080
2008	7651930
2009	5807305
2010	8643198
2011	7955143
2012	8119819
2013	8867188
2014	10874542
2015	10054817.52
2016	10797277.27
2017	10346519.01
2018	10831072.34
2019	10406702.01
2020	12787449.83
2021	12669760.42
2022	10271237.89