Year	metric tons
1960	9271
1961	10054
1962	9985
1963	11282
1964	11812
1965	11673
1966	10526
1967	9637
1968	10827
1969	11180
1970	12815
1971	13626
1972	14095
1973	14283
1974	12416
1975	12441
1976	12446
1977	13353
1978	12969
1979	12283
1980	11391
1981	11263
1982	11260
1983	11024
1984	11514
1985	12954
1986	12289
1987	14027
1988	15135
1989	14593
1990	14638
1991	15102
1992	12211
1993	13604
1994	14984
1995	16180
1996	17553
1997	18264
1998	18556
1999	18777
2000	20098
2001	21318
2002	22256
2003	20776
2004	22303
2005	22409
2006	22117
2007	21434
2008	20017
2009	19177
2010	19895
2011	20817
2012	20342.4
2013	22251.6
2014	20166
2015	19640
2016	18914
2017	17997
2018	17025
2019	16940
2020	15280
2021	14875
2022	13840