Year	metric tons
1960	2500
1961	2500
1962	2800
1963	2800
1964	2800
1965	3000
1966	3000
1967	3000
1968	3300
1969	4000
1970	5400
1971	5200
1972	6600
1973	6400
1974	7679
1975	7038
1976	6660
1977	7667
1978	7108
1979	6525
1980	6348
1981	7132
1982	9780
1983	9434
1984	10346
1985	12176
1986	12849
1987	17279
1988	17117
1989	16898
1990	14098
1991	18576
1992	18861
1993	20579
1994	18145
1995	16395
1996	11869
1997	14025
1998	12093
1999	12205
2000	9615
2001	10986
2002	10706
2003	10968
2004	9971
2005	9855
2006	8681
2007	8325
2008	6871
2009	7856
2010	7366
2011	7306
2012	6352
2013	7915.91
2014	14658.02
2015	15799.2
2016	18215.37
2017	24986.84
2018	29341.48
2019	34076.29
2020	25989.69
2021	30029.3
2022	33284.19