Year	metric tons
1960	19233498
1961	20644548
1962	21414109
1963	21699819.1
1964	22510978.1
1965	24088392.4
1966	25727212.8
1967	26626261
1968	28067999
1969	27065424
1970	29115879
1971	30438542
1972	30434566
1973	31581356
1974	32578886
1975	32115357
1976	34355698
1977	34598825.5
1978	35013918.099999994
1979	35591755.699999996
1980	36536701.9
1981	38005656.95
1982	38084349.099999994
1983	39820966.24
1984	42292837.46999999
1985	42308433.879999995
1986	44249860.27
1987	44153881.23
1988	45237080.24
1989	45108864.79
1990	42136773.519999996
1991	41003815.00999999
1992	42909803.28999999
1993	41962558.38000001
1994	43336525.60999999
1995	42826054.65
1996	41695360.24
1997	41876456.370000005
1998	37460489.49999999
1999	38750518.02
2000	37726580.010000005
2001	37838157.04
2002	37783546.13999999
2003	36862921.97
2004	37705947.25
2005	36767095.620000005
2006	36283352.36000001
2007	36073254.71
2008	34874827.92999999
2009	34053926.57
2010	33409280.420000006
2011	33817073.27000001
2012	33195676.559999995
2013	32677462.74
2014	33870462.51
2015	33435109.74000001
2016	31761028.599999998
2017	34141941.35
2018	34275246.379999995
2019	33613175.35
2020	32683687.390000008
2021	33124432.84
2022	28369828.459999997