Year	metric tons
1960	7822578
1961	8227795
1962	8341651
1963	8759214.1
1964	9516754.1
1965	10733043.4
1966	11420465.8
1967	11999989
1968	11796369
1969	11254031
1970	11926735
1971	12067648
1972	12211701
1973	12491207
1974	12634036
1975	12416208
1976	13398952
1977	13309489
1978	12592808.100000001
1979	12511545.700000001
1980	12689844.9
1981	12782404.65
1982	12335901.100000001
1983	12821978.620000001
1984	13192412.66
1985	12939623.450000001
1986	12729283.129999999
1987	12784969.56
1988	13105849.56
1989	12350456.6
1990	11073009.87
1991	11027932.850000001
1992	19015619.48
1993	17579893.269999996
1994	16962312.61
1995	18376668.35
1996	18542587.299999997
1997	18931558.69
1998	18107692.48
1999	17277761.59
2000	17361656.39
2001	17053660.419999998
2002	16529752.84
2003	15662973.94
2004	15105452.83
2005	14884063.59
2006	14567656.059999999
2007	14645534.290000001
2008	14183991.200000003
2009	14396046.820000002
2010	14922515.809999999
2011	14446680.89
2012	14083351.67
2013	14522261.959999997
2014	14702094.929999998
2015	15232332.739999996
2016	14724643.85
2017	15983876.120000003
2018	16115022.550000003
2019	15211217.620000003
2020	15042973.28
2021	14820676.46
2022	14301021.209999999