Year	metric tons
1961	331308
1962	356020
1963	356900
1964	227958
1965	156970
1966	164999
1967	168593
1968	210249
1969	311115
1970	462723
1971	443328
1972	408966
1973	423632
1974	532548
1975	541346
1976	546178
1977	551874
1978	553558
1979	521200
1980	573934
1981	556987
1982	615852
1983	613744
1984	650860
1985	620420
1986	666617
1987	562139
1988	584957
1989	617481
1990	539689
1991	483643.5
1992	442005.5
1993	254233.71
1994	487047.85
1995	500900
1996	717530.9
1997	817272.34
1998	618526.25
1999	796890
2000	826200
2001	900115
2002	1001179
2003	1075955
2004	889369
2005	732197
2006	744119
2007	809469
2008	762180
2009	868697
2010	779086
2011	920658
2012	1003983
2013	1104303
2014	1017580
2015	791665.9
2016	930967.8
2017	786203
2018	812373.93
2019	703430.38
2020	525731.5
2021	466783.11
2022	355610.42