Year	metric tons
1960	1716905
1961	1809529
1962	1947150
1963	2005689
1964	2177282
1965	2309351
1966	2438117
1967	2542377
1968	2680180
1969	2826341
1970	3017057
1971	3281124
1972	3533724
1973	3623206
1974	3606395
1975	3507636
1976	3576881
1977	3725548
1978	3786435
1979	3760546
1980	3752152
1981	3877846
1982	3922317
1983	4142377.24
1984	4253046.140000001
1985	4357009.11
1986	4652480.72
1987	4800328.28
1988	4880818.970000001
1989	5000169.99
1990	5228203.170000001
1991	5256803.25
1992	5501168
1993	5552831.610000001
1994	5487292.279999999
1995	5779819.73
1996	5823481.16
1997	6225979.42
1998	6434171.089999999
1999	7107098.609999999
2000	7348775.739999999
2001	7605271.07
2002	7761059.8
2003	8242053.279999999
2004	8960300.700000001
2005	9268321.020000001
2006	9500514.85
2007	9579756.040000001
2008	9647361.85
2009	10132007.02
2010	10334765.290000001
2011	10595796.250000002
2012	10891962.63
2013	11034272.509999998
2014	11395947.770000001
2015	11326757.640000002
2016	11928551.299999999
2017	12959360.819999998
2018	13117648.51
2019	12966058.56
2020	12567995.43
2021	12612899.100000001
2022	12616669.85