Year	metric tons
1961	436400
1962	421000
1963	392348
1964	400221
1965	388943
1966	646900
1967	585651
1968	522656
1969	535463
1970	857500
1971	823100
1972	723500
1973	764100
1974	890100
1975	671500
1976	688800
1977	639000
1978	540000
1979	780000
1980	674000
1981	725000
1982	628000
1983	432000
1984	1072000
1985	921000
1986	866700
1987	1057400
1988	1146000
1989	1183700
1990	843800
1991	1436200
1992	1254200
1993	1644700
1994	1593915
1995	1796920
1996	1770069
1997	1669220.67
1998	1787521.22
1999	1685991.8
2000	1710622.41
2001	1626674.06
2002	2155213.75
2003	2040844.47
2004	1830250.66
2005	1948025.7
2006	1919026.8
2007	1672835
2008	2296821.04
2009	2607164.16
2010	2906709.36
2011	2618992
2012	2890743
2013	2745913
2014	2780040
2015	2753193.99
2016	2798251.57
2017	3126782.91
2018	3573624.57
2019	4411039.86
2020	4636040.87
2021	4858041.11
2022	5136566.36