Year	metric tons
1960	17501244
1961	18646853
1962	19060069
1963	19199946.1
1964	19341053.1
1965	21063063.4
1966	21847448.8
1967	23382503
1968	24696952
1969	23900363
1970	25600365
1971	26574810
1972	27120157
1973	27992433
1974	28428956
1975	27830633
1976	29541508
1977	29422997
1978	29157985.1
1979	28800106.7
1980	29612138.9
1981	30577617.159999996
1982	30973369.259999998
1983	32025788.020000003
1984	33233060.340000004
1985	32577247.429999996
1986	33979720.370000005
1987	34352596.81
1988	34835722.5
1989	33839190.36
1990	32199254.34
1991	30868605.67
1992	31878103.75
1993	31054320.57
1994	30782750.479999997
1995	30206716.669999998
1996	29611015.51
1997	30360260.009999998
1998	29052436.110000003
1999	28562687.8
2000	27665275.53
2001	27766895.42
2002	26972353.19
2003	26724727.38
2004	26436339.580000002
2005	26150420.040000003
2006	26247608.450000003
2007	26212236.7
2008	25542758.129999995
2009	25251899.86
2010	25514516.599999998
2011	25214086.89
2012	24538331.959999997
2013	24738694.68
2014	25427554.12
2015	25371005.829999994
2016	24421774.05
2017	25743972.39
2018	25536982.78
2019	24902440.14
2020	24061266.61
2021	23987868.200000007
2022	18838803.72