Year	metric tons
1960	8500
1961	11500
1962	11900
1963	10000
1964	10000
1965	9000
1966	9000
1967	9000
1968	8500
1969	8500
1970	8500
1971	9300
1972	9500
1973	9600
1974	10100
1975	10100
1976	10130
1977	10107
1978	9759
1979	9826
1980	9230
1981	8018
1982	8065
1983	8813
1984	9610
1985	9881
1986	9813
1987	8969
1988	11880
1989	13068
1990	13650
1991	15250
1992	19100
1993	23000
1994	25277
1995	24750
1996	24255
1997	20035
1998	17546
1999	17264
2000	5540
2001	14319
2002	14892
2003	12482
2004	13471
2005	13096
2006	17703
2007	16398
2008	13055
2009	16154
2010	15390
2011	17998
2012	15383
2013	18349
2014	15204
2015	17025
2016	17307
2017	19267
2018	15346
2019	13475
2020	12874.92
2021	13231
2022	12529.49