Year	metric tons
1960	4200
1961	3700
1962	4000
1963	4000
1964	4000
1965	4500
1966	5000
1967	6000
1968	6000
1969	7000
1970	8000
1971	8200
1972	8900
1973	9300
1974	10064
1975	10046
1976	10132
1977	10190
1978	10812
1979	13484
1980	11791
1981	13004
1982	13553
1983	15277
1984	14650
1985	11478
1986	16053
1987	18731
1988	16074
1989	14802
1990	6463
1991	9620
1992	8891
1993	7782
1994	7721
1995	8829
1996	7408
1997	8491
1998	10697
1999	14682
2000	11518
2001	10496
2002	11042
2003	10464
2004	13725
2005	12147
2006	8894
2007	14488
2008	7890
2009	10700
2010	11700
2011	13421.05
2012	14028.69
2013	15090.98
2014	14432.19
2015	14009.22
2016	13718.1
2017	11974.1
2018	14122.29
2019	16134.03
2020	31661.68
2021	25169.14
2022	29337.99