Year	metric tons
1960	787910
1961	748670
1962	782420
1963	837580
1964	850030
1965	864690
1966	881650
1967	951500
1968	986660
1969	970714
1970	939498
1971	846312
1972	761507
1973	850953
1974	897600
1975	828055
1976	744507
1977	655548
1978	625086
1979	590774
1980	562566
1981	585026
1982	551637
1983	544751
1984	553756
1985	426457
1986	415388
1987	399721
1988	393112
1989	412656
1990	390739
1991	310593
1992	313544
1993	322510
1994	279013
1995	303985
1996	319648
1997	324785
1998	339107
1999	317421
2000	269975
2001	262551
2002	271624
2003	331927
2004	315576
2005	326053
2006	328416
2007	335505
2008	318258
2009	282954
2010	283840
2011	273024
2012	240768
2013	260396
2014	268775
2015	291653
2016	312986
2017	284216
2018	313409
2019	265150.8
2020	244352.57
2021	220301.27
2022	206266