Year	metric tons
1960	1388142
1961	1527010
1962	1321310
1963	1387812
1964	1607991
1965	2308843
1966	2867099
1967	3250881
1968	2804413
1969	2490990
1970	2983097
1971	3103016
1972	3204960
1973	3016131
1974	2671073
1975	2555454
1976	3420397
1977	3546340
1978	2715019
1979	2768418
1980	2535773
1981	2700340
1982	2650209
1983	2972432
1984	2601762
1985	2252236
1986	2073607
1987	2122605
1988	2010322
1989	2087169
1990	1950525
1991	2363389
1992	2751218
1993	2749236
1994	2769670
1995	2986759
1996	3143134
1997	3422357
1998	3451742
1999	3282008
2000	3383120
2001	3372900
2002	3474416
2003	3286434
2004	3309501
2005	3208377
2006	3114154
2007	3356219
2008	3432254.25
2009	3655340.2600000002
2010	3858272.01
2011	3586469.8499999996
2012	3603765.6500000004
2013	3489261.66
2014	3782861.14
2015	3833095.16
2016	3527509.7199999997
2017	3867391.2700000005
2018	4020185.0999999996
2019	3931628.2299999995
2020	4115779.83
2021	4244846.2700000005
2022	4262103.08