Year	metric tons
1960	4510
1961	7300
1962	5350
1963	5550
1964	5910
1965	6610
1966	6580
1967	6510
1968	7600
1969	9900
1970	11750
1971	10400
1972	12120
1973	11610
1974	10501
1975	12262
1976	5993
1977	6897
1978	4474
1979	4535
1980	4046
1981	4620
1982	3796
1983	4520
1984	5095
1985	4909
1986	4540
1987	6626
1988	4602
1989	7786
1990	7670
1991	8186
1992	11272
1993	9580
1994	14766
1995	14301
1996	16178
1997	16618
1998	21683
1999	24447
2000	24583
2001	28979
2002	31127
2003	35854
2004	33160
2005	29862
2006	32101
2007	31019.3
2008	24206.4
2009	26184.16
2010	35156.1
2011	35586
2012	36004.2
2013	35594.7
2014	33541.82
2015	39585.17
2016	43165.1
2017	48690.75
2018	39371.4
2019	31457.5
2020	29809
2021	32170
2022	33740