Year	metric tons
1960	4000
1961	4000
1962	4000
1963	5000
1964	5000
1965	5600
1966	7000
1967	8000
1968	8700
1969	9500
1970	9800
1971	9400
1972	11200
1973	13900
1974	8689
1975	10778
1976	10513
1977	13914
1978	15900
1979	9121
1980	6996
1981	5944
1982	5000
1983	4565
1984	4356
1985	4191
1986	2501
1987	5031
1988	4728
1989	4656
1990	3162
1991	5783
1992	6743
1993	8212
1994	11721
1995	11989
1996	16224
1997	17423
1998	19974
1999	24042
2000	27954
2001	25783
2002	25647
2003	22659
2004	27548
2005	38222
2006	43418
2007	38849
2008	47390
2009	56796
2010	57950
2011	49293
2012	58134.99
2013	67385.91
2014	84930
2015	66070
2016	66204.98999999999
2017	75881
2018	84027.39
2019	80833.29
2020	72955.54000000001
2021	86280.44
2022	85300.82