Year	metric tons
1960	1606640.01
1961	1459466
1962	1529246
1963	1603008
1964	1953853
1965	2004693
1966	2074317.01
1967	2101331
1968	2286518
1969	2372928
1970	2555433
1971	2663622
1972	2554684
1973	2875049
1974	3129240
1975	2938297
1976	2857112
1977	3019921.99
1978	3017823.01
1979	3027762.01
1980	3094105
1981	3109210
1982	3024999
1983	3202590.5
1984	3511687.1
1985	3479219.6
1986	3614116.89
1987	3504551
1988	3675936
1989	4096054
1990	4239531
1991	4386868
1992	4453085.09
1993	4831210.890000001
1994	4996138.67
1995	5010905.91
1996	5255151.3100000005
1997	5416380.84
1998	5307385.859999999
1999	5600215.7
2000	5763306.6
2001	5839044
2002	5877590
2003	5894220.2
2004	5620971.4
2005	5933165.99
2006	6305756
2007	6308316
2008	6637383
2009	6851904
2010	7433413
2011	6960042.6899999995
2012	7504484.02
2013	7314960.34
2014	7717043.039999999
2015	7613385.77
2016	8027330.41
2017	8527228.74
2018	8365540.3100000005
2019	8491099.68
2020	7624537.59
2021	8043692.850000001
2022	8577568.34