Year	metric tons
1961	1682841
1962	1615349
1963	1792560
1964	1558402
1965	1417047
1966	1184372
1967	2446538
1968	1239410
1969	2001005
1970	2137398
1971	2216000
1972	1796000
1973	2171000
1974	2482200
1975	2857184
1976	3365000
1977	2927000
1978	3272000
1979	1986000
1980	2701000
1981	4105000
1982	2286000
1983	2524500
1984	1448000
1985	4112900
1986	3798600
1987	1699200
1988	5132200
1989	2063500
1990	1729000
1991	4637100
1992	5381200
1993	3101500
1994	5145650
1995	3305200
1996	5202000
1997	4209000
1998	5583000
1999	3066000
2000	3259000
2001	5339000
2002	3714000
2003	6372748
2004	3516000
2005	6243000
2006	5806000
2007	6691000
2008	5269000
2009	5552195
2010	3562350
2011	5598000
2012	3038000
2013	5959500
2014	8072300
2015	4104600
2016	8523000
2017	5519957.59
2018	8875000
2019	5646000
2020	5709038.96
2021	5094456.39
2022	7456084.13