Year	metric tons
1961	755600
1962	695100
1963	950000
1964	770100
1965	664000
1966	703855
1967	725205
1968	721400
1969	715350
1970	676354
1971	663885
1972	485010
1973	468000
1974	593830
1975	590950
1976	590000
1977	619500
1978	640700
1979	549700
1980	572800
1981	401400
1982	392900
1983	449729
1984	354966
1985	704919
1986	634644
1987	548556
1988	808086
1989	616841
1990	601390
1991	812000
1992	976310
1993	617078
1994	1174869
1995	907316
1996	877738
1997	985833
1998	1291715
1999	1249798
2000	930038
2001	1321294
2002	1212390
2003	1618139
2004	1212903
2005	1824463
2006	1998148
2007	1972035
2008	1927679
2009	1581067
2010	3247583
2011	1657180
2012	3172411
2013	2622545
2014	2748668
2015	2452528
2016	2873660
2017	2716901
2018	3021972.6
2019	2925292
2020	2882262.08
2021	2620314.17
2022	2798641