Year	metric tons
1960	18229962
1961	19545207
1962	20134605
1963	20383555.1
1964	21158274.1
1965	22670866.4
1966	24214592.8
1967	25132856
1968	26301366
1969	25350064
1970	27056951
1971	28230878
1972	28105022
1973	28802080
1974	29516626
1975	28902015
1976	30978617
1977	31012698
1978	31840206.099999998
1979	32588717.7
1980	33604995.9
1981	35346204.16
1982	35225956.26
1983	36224379.22
1984	38581365.98
1985	38308200.919999994
1986	40075548.19
1987	39956405.059999995
1988	40658616.76
1989	40523429.7
1990	37581060.510000005
1991	36389634.36
1992	37964033.43
1993	36875652.230000004
1994	38185127.300000004
1995	37659143.3
1996	36629196.92
1997	36347020.870000005
1998	31595680.060000002
1999	33007172.270000003
2000	31823479.599999998
2001	31641353.099999998
2002	31314584.62
2003	30014601.330000002
2004	30690700.390000004
2005	29629854.500000007
2006	28890686.48
2007	28516315.619999997
2008	27644735.419999998
2009	27092231.49
2010	26421458.98
2011	26694479.4
2012	25453406.519999992
2013	24884431.979999997
2014	25375711.88
2015	24879609.970000003
2016	23211035.46
2017	24845492.619999997
2018	24735360.06000001
2019	23788993.229999997
2020	22677838.390000008
2021	22728534.07
2022	20925639.240000002