Year	metric tons
1961	90322
1962	96298
1963	81596
1964	87628
1965	85933
1966	81900
1967	69621
1968	89100
1969	85078
1970	95742
1971	97142
1972	86300
1973	82900
1974	58200
1975	53400
1976	37900
1977	38600
1978	63100
1979	48000
1980	70100
1981	90000
1982	93300
1983	68200
1984	86500
1985	116090
1986	102060
1987	92430
1988	100170
1989	96781
1990	90331
1991	110988
1992	96206
1993	96977
1994	95332
1995	98480
1996	103417
1997	100476
1998	106346
1999	150970
2000	175700
2001	199978
2002	138859
2003	204325
2004	223302
2005	204998
2006	214694
2007	149940
2008	234442
2009	310375
2010	362908
2011	182539
2012	223560
2013	226953
2014	174068
2015	205000
2016	174000
2017	135000
2018	86000
2019	96900
2020	106356
2021	112566
2022	106764