Year	metric tons
1961	180350284
1962	191717030
1963	208934794
1964	189441657
1965	215831388
1966	223108141
1967	238238481
1968	236951862
1969	241210503
1970	215421466
1971	276484211
1972	263584221
1973	274283208
1974	235482331
1975	286391317
1976	302910375
1977	308253477
1978	318498324
1979	338580580
1980	311248682
1981	381751728
1982	386436963
1983	255104812
1984	357543004
1985	395357516
1986	372295916
1987	332129247
1988	242022300
1989	332327366
1990	369216839
1991	333915690.6
1992	402667797.36
1993	310588442.37
1994	402553423.57
1995	326945410
1996	394274223.06
1997	386189061.49
1998	400410244.46
1999	389476964
2000	393721906
2001	368386033.58
2002	333190351.84
2003	397444831.26
2004	439801963.41
2005	417398745.76
2006	386914100
2007	463136160
2008	458430336
2009	468358066.07
2010	447248529.74
2011	433882455.77
2012	408056624
2013	500843851
2014	494532591
2015	485433370.62
2016	562371914.87
2017	497042710.02
2018	498437728.46
2019	482348004.16
2020	498573429.21
2021	499183358.61
2022	475981346.66