Year	metric tons
1961	6629757
1962	5902917
1963	6377585
1964	7380506
1965	7212458
1966	8041079
1967	7453095
1968	7156833
1969	8375894
1970	8034292
1971	7968165
1972	7979340
1973	8056924
1974	8281408
1975	9044456
1976	9882637
1977	9643628
1978	10541876
1979	10148227
1980	6676479
1981	8530055
1982	8583504
1983	8995642
1984	9269310
1985	8807552
1986	8637576
1987	8467053
1988	9163507
1989	8950058
1990	8434015
1991	7720465
1992	7677307
1993	6814911
1994	7158465
1995	6767246
1996	7505223
1997	7607782
1998	7070638
1999	7395754
2000	7435175
2001	7746435
2002	6990361
2003	6400167
2004	7014673
2005	6721823
2006	6541077
2007	6235335
2008	6752447
2009	6757669.49
2010	6020702.01
2011	5825775.77
2012	5604303.9
2013	5810450.68
2014	5852499.19
2015	5976258.87
2016	5831045.8
2017	5487987.7
2018	5418712.13
2019	5272971.32
2020	4945343.81
2021	5443029.34
2022	5205824.53