Year	metric tons
1961	79000
1962	79500
1963	80000
1964	74500
1965	76000
1966	74000
1967	70500
1968	68500
1969	47500
1970	55000
1971	45250
1972	50500
1973	50500
1974	57500
1975	92500
1976	110000
1977	94000
1978	73000
1979	81000
1980	93000
1981	132000
1982	160150
1983	140750
1984	158500
1985	158000
1986	162273
1987	153000
1988	150065
1989	147931
1990	167269
1991	178920
1992	168916
1993	180738
1994	190141
1995	200531
1996	174588
1997	139936
1998	138900
1999	145368
2000	177884
2001	161681
2002	151444
2003	143411
2004	171375
2005	212538
2006	225259
2007	183863
2008	216998
2009	227342.26
2010	256131.24
2011	218151.1
2012	248203.95
2013	264093.9
2014	166221.78
2015	207988.47
2016	225060.29
2017	210996.37
2018	223838.6
2019	239830.09
2020	257733.33
2021	280525.39
2022	301273