Year	metric tons
1960	4549642
1961	4760127
1962	4911804
1963	5255575.1
1964	5578831.1
1965	5760259.4
1966	5816244.8
1967	6312550
1968	6908932
1969	6488954
1970	6576532
1971	6627754
1972	6641896
1973	6877278
1974	7384543
1975	7315642
1976	7279035
1977	6734878
1978	6535941.100000001
1979	6373310.7
1980	6915035.9
1981	6924351.649999999
1982	7116674.1
1983	7168965.619999999
1984	7215976.57
1985	7077973.33
1986	7146600
1987	7016010.16
1988	7327214.76
1989	7053539.9
1990	6164980.17
1991	6259523.850000001
1992	7090236.28
1993	6686019.27
1994	6923693.609999999
1995	7281611.049999999
1996	6657097.600000001
1997	6729400.89
1998	6466986.98
1999	6125584.6899999995
2000	6092449.39
2001	6200808.220000001
2002	5864002.04
2003	5391909.34
2004	5400705.32
2005	5191204.59
2006	5183652.96
2007	4784766.89
2008	4675950.949999999
2009	4735872.209999999
2010	4879132.14
2011	4601204.470000001
2012	4091533.6000000006
2013	4451318.54
2014	4736613.600000001
2015	4721230.49
2016	4551848.0200000005
2017	4911529.59
2018	4687476.380000001
2019	4225315.7
2020	3995680.5599999996
2021	3734627.7899999996
2022	3657528.9499999997