Year	metric tons
1961	164089
1962	162764
1963	168432
1964	192256
1965	211946
1966	228412
1967	214000
1968	231406
1969	250000
1970	268600
1971	276000
1972	280000
1973	289500
1974	325141
1975	281733
1976	396849
1977	392529
1978	429390
1979	437646
1980	453005
1981	459903
1982	492708
1983	581446
1984	643532
1985	607731
1986	549343
1987	599490
1988	517751
1989	577387
1990	488250
1991	525975.39
1992	629154.5
1993	498279
1994	416849.32
1995	553093.7
1996	527213.11
1997	564168
1998	519711.94
1999	604649
2000	610146
2001	770803
2002	766129
2003	656277.02
2004	619972.7
2005	682011.03
2006	745339
2007	779887
2008	806624
2009	815971
2010	886456.16
2011	912362
2012	707550.49
2013	772950.27
2014	936568.81
2015	941949.7
2016	984000.73
2017	1039462
2018	1106065.79
2019	1060639.28
2020	1087186.82
2021	1160646.99
2022	1212049.17