Year	metric tons
1961	1847205
1962	2332325
1963	1432038
1964	1629550
1965	2006634
1966	1858708
1967	2051724
1968	2899566
1969	2473690
1970	2112408
1971	1588491
1972	3901326
1973	1603339
1974	1960870
1975	1372508
1976	2109366
1977	1444700
1978	1780469
1979	1480600
1980	1891900
1981	2035800
1982	2065900
1983	1821700
1984	1100160
1985	2932251
1986	2280630
1987	1728000
1988	2590600
1989	1496700
1990	3454800
1991	2672653
1992	2959211
1993	3239908
1994	2830150
1995	2540110
1996	3004520
1997	2215530
1998	2431550
1999	1604520
2000	904480
2001	1818903.07
2002	4124870
2003	3521487.33
2004	3316916.71
2005	3708150
2006	3785500
2007	3752471
2008	2225411
2009	2650113
2010	4362383
2011	4270151
2012	4790950
2013	6498524
2014	7048606
2015	3471115.91
2016	4007685
2017	3735255
2018	2615277
2019	6913550
2020	8885242
2021	5302192
2022	3421743