Year	metric tons
1960	3400
1961	4200
1962	6000
1963	9000
1964	6300
1965	5000
1966	5000
1967	3700
1968	4300
1969	3000
1970	2400
1971	5400
1972	16400
1973	16200
1974	15050
1975	9142
1976	4715
1977	7372
1978	8783
1979	8934
1980	8892
1981	8208
1982	6840
1983	3251
1984	3000
1985	2000
1986	2345
1987	2283
1988	2499
1989	4741
1990	3354
1991	3145
1992	2464
1993	2172
1994	2533
1995	3651
1996	4167
1997	6341
1998	7025
1999	11014
2000	16265
2001	20821
2002	23600
2003	55900
2004	51506
2005	50058
2006	29875
2007	29768
2008	30000
2009	29954
2010	40070
2011	53258
2012	46600
2013	45200
2014	47329
2015	27300
2016	34892
2017	25545
2018	31392
2019	40409.65
2020	46649
2021	47672
2022	48170