Year	metric tons
1960	22300
1961	22000
1962	22000
1963	22000
1964	25000
1965	25000
1966	25000
1967	27000
1968	27000
1969	27000
1970	27400
1971	26400
1972	31600
1973	43200
1974	51244
1975	50829
1976	65022
1977	66096
1978	67047
1979	69600
1980	78444
1981	71164
1982	55449
1983	57906
1984	64273
1985	73855
1986	73018
1987	72916
1988	73943
1989	71881
1990	77310
1991	85998
1992	79893
1993	82356
1994	81885
1995	107970
1996	104955
1997	115654
1998	127620
1999	124384
2000	114750
2001	142198
2002	179584
2003	228116
2004	256300
2005	238400
2006	229660
2007	179916
2008	132062
2009	179603
2010	163861
2011	154060.99
2012	227114.98
2013	228782.99
2014	214201.98
2015	177408
2016	152130.99
2017	131289.99
2018	131307.99
2019	131305.73
2020	131306.52
2021	154940
2022	178190