Year	metric tons
1960	40700
1961	31200
1962	28500
1963	26500
1964	30900
1965	34600
1966	38800
1967	48900
1968	50500
1969	63500
1970	75200
1971	69200
1972	86600
1973	87391
1974	85782
1975	84165
1976	90019
1977	89222
1978	100237
1979	89552
1980	144391
1981	185429
1982	205954
1983	197088
1984	224827
1985	248827
1986	248878
1987	263767
1988	273824
1989	219849
1990	248374
1991	265510
1992	279876
1993	308504
1994	327371
1995	423559
1996	365443
1997	328045
1998	360615
1999	319385
2000	312392
2001	392528
2002	318720
2003	301218
2004	310570
2005	297181
2006	241277
2007	244368
2008	234819
2009	298584
2010	348441
2011	243454.95
2012	305426.85
2013	275949.83
2014	306423.74
2015	264370.53
2016	259855.36
2017	276329.84
2018	251240.96
2019	238443.64
2020	208502.06
2021	234158.85
2022	203538.73