Year	metric tons
1960	400570
1961	450640
1962	500720
1963	500810
1964	550910
1965	601030
1966	601150
1967	601300
1968	651460
1969	651650
1970	690100
1971	740100
1972	818100
1973	820200
1974	822082
1975	640070
1976	641605
1977	643769
1978	646895
1979	647128
1980	646970
1981	651256
1982	689498
1983	726587
1984	750196
1985	766081
1986	793191
1987	805285
1988	830593
1989	839944
1990	846144
1991	900720
1992	936195
1993	1002567
1994	1034980
1995	1109462
1996	1193874
1997	1315290
1998	1413953
1999	1552417
2000	1661384
2001	1781057
2002	1890459
2003	1998197
2004	2102026
2005	2215957
2006	2328545
2007	2440011
2008	2563296
2009	2885864
2010	3035101
2011	3124677
2012	3261781
2013	3410254
2014	3549099
2015	3684245
2016	3878324
2017	4134436
2018	4276641
2019	4384219
2020	4503371
2021	4621228.04
2022	4758731