Year	metric tons
1961	18045171
1962	18779568
1963	18933408
1964	19182984
1965	19951194
1966	17052755
1967	20165748
1968	22506261
1969	25484093
1970	25408987
1971	24801404
1972	23366728
1973	25548997
1974	28813190
1975	27500753
1976	27921480
1977	28249500
1978	26662277
1979	27634144
1980	30099941
1981	32772642
1982	32779473
1983	32854986
1984	31992406
1985	36883092
1986	43263399
1987	39632652
1988	43255570
1989	45767756
1990	44987425
1991	45951035.36
1992	48810393.47
1993	52532334.24
1994	52665942.99
1995	56569145.06
1996	57236304.89
1997	57192007.42
1998	60382623.19
1999	60838437.43
2000	61967033.89
2001	58166871.86
2002	59920280.72
2003	64514615.92
2004	68564058.17
2005	73348562.97
2006	77278812.6
2007	77763219.39
2008	78707295.32
2009	73701500.26
2010	76002116.07000001
2011	75493462.5
2012	74816629.99
2013	76567311.77
2014	85160493.71000001
2015	84024365.26
2016	89392403.00999999
2017	90873842.94
2018	90964252.8
2019	90463590.29
2020	94072267.02
2021	98306220.9
2022	95340653.86