Year	metric tons
1960	474880
1961	505098
1962	531470
1963	541412
1964	593475
1965	591828
1966	694322
1967	640424
1968	614804
1969	634609
1970	687642
1971	704721
1972	752750
1973	921488
1974	898963
1975	864249
1976	934355
1977	905199
1978	910069.9
1979	938276.7999999999
1980	987376.1
1981	1038654.0800000001
1982	1032889.64
1983	1179314.24
1984	1199784.88
1985	1276059.9900000002
1986	1420378.55
1987	1422105.05
1988	1575689.65
1989	1489955.3199999998
1990	1535503.06
1991	1588588.55
1992	1569900.81
1993	1677432.32
1994	1884931.47
1995	2023076.68
1996	1792001.81
1997	2006436.51
1998	1984901.7000000002
1999	2060476.98
2000	2211078.93
2001	2569228.4899999998
2002	2466894.4699999997
2003	2512945.22
2004	2590634.07
2005	2676910.11
2006	2478328.44
2007	2480108.32
2008	2491842.38
2009	2760764.61
2010	2736859.91
2011	2618032.4400000004
2012	2981173.22
2013	3058557.37
2014	3085078.5300000003
2015	3097993.3899999997
2016	3406097.3100000005
2017	3605862.6100000003
2018	3975391.41
2019	3886212.82
2020	3946156.96
2021	4255088.539999999
2022	4302558.25