Year	metric tons
1960	695317
1961	722767
1962	777967
1963	828667
1964	895417
1965	957567
1966	1020971
1967	1084141
1968	1135591
1969	1244683
1970	1328233
1971	1425737
1972	1526885
1973	1554686
1974	1571310
1975	1617152
1976	1577165
1977	1672139
1978	1681011
1979	1619332
1980	1590431
1981	1602180
1982	1610473
1983	1700322.1
1984	1782102
1985	1766434
1986	1932200
1987	2065092.9
1988	2026896.9
1989	2091777.9
1990	2187359
1991	2135210
1992	2342347
1993	2277631
1994	2174080
1995	2321382
1996	2517063.6
1997	2560813
1998	2497503.9
1999	2675702.55
2000	2753909
2001	2775577.5
2002	2686868.5
2003	2986935.5
2004	3214953.9
2005	3223948.39
2006	3034172.49
2007	3137861.51
2008	3222811.64
2009	3379296
2010	3530254.6399999997
2011	3756211.2399999998
2012	3870478.27
2013	3897929.44
2014	3963754.3800000004
2015	3971476.2599999993
2016	4337431.91
2017	4940925.72
2018	5126694.569999999
2019	5112104.380000001
2020	4952242.5200000005
2021	5268997.649999999
2022	5162592.41