Year	metric tons
1961	255000
1962	250000
1963	243000
1964	237000
1965	235000
1966	235000
1967	250000
1968	243000
1969	247000
1970	235800
1971	222000
1972	319100
1973	185300
1974	185100
1975	241800
1976	251100
1977	264400
1978	260200
1979	260600
1980	266100
1981	383700
1982	404000
1983	359600
1984	495500
1985	513500
1986	586100
1987	543170
1988	601370
1989	653760
1990	344652.05
1991	255660
1992	208862.89
1993	164925
1994	405209.38
1995	284919.89
1996	282030.41
1997	305334.29
1998	201114
1999	298553.29
2000	392408
2001	429062
2002	441850.38
2003	402824.49
2004	366470
2005	355708.72
2006	260298.84
2007	196970
2008	230588.6
2009	229641
2010	355814.89
2011	118872.5
2012	385345
2013	383243
2014	256619.98
2015	265481.36
2016	142413.68
2017	174518.17
2018	234815.8
2019	184590.75
2020	177641.96
2021	177685.43
2022	177644.58