Year	metric tons
1960	472068
1961	501475
1962	526575
1963	536026
1964	590603
1965	589026
1966	694803
1967	637425
1968	609060
1969	617133
1970	669851
1971	680227
1972	749758
1973	920861
1974	933022
1975	903757
1976	981799
1977	951178
1978	951897.8999999999
1979	992379.8
1980	1023493.1
1981	1043939.0800000001
1982	1092548.6400000001
1983	1214932.24
1984	1260833.88
1985	1357043.99
1986	1525108.55
1987	1575664.05
1988	1763705.65
1989	1707817.3199999998
1990	1767427.06
1991	1820059.55
1992	1854591.81
1993	1966156.3199999998
1994	2170522.4699999997
1995	2358998.6799999997
1996	2163856.21
1997	2375460.51
1998	2391624.7
1999	2550593.48
2000	2819765.9299999997
2001	3132787.9899999998
2002	3040429.97
2003	3155717.72
2004	3229671.97
2005	3415872.6100000003
2006	3466123.94
2007	3428657.2199999997
2008	3522394
2009	3794615.09
2010	3974906.9700000007
2011	3908245.35
2012	4385427.749999999
2013	4620055.3
2014	4815085.91
2015	4882369.37
2016	5300705.970000002
2017	5486719.140000001
2018	5959355.709999999
2019	6173649.3
2020	6243193.04
2021	6449644.69
2022	5199977.94