Year	metric tons
1960	98200
1961	91600
1962	71500
1963	140000
1964	133600
1965	154483
1966	143811
1967	230994
1968	194852
1969	254903
1970	270442
1971	263814
1972	289374
1973	251481
1974	249952
1975	282072
1976	321931
1977	302664
1978	344199
1979	434487
1980	549203
1981	573054
1982	613260
1983	674157
1984	674747.09
1985	677936.12
1986	686927.13
1987	734469.4
1988	786608.8
1989	551195.7
1990	438512.69999999995
1991	410017
1992	6556210.2
1993	5359159
1994	4678776
1995	5431848.3
1996	5700927.7
1997	5581823.8
1998	5500974.5
1999	5236107.9
2000	5009715
2001	4543702.2
2002	4150493.8
2003	4125107.6
2004	3811963.51
2005	3988978
2006	4134551.1
2007	4451876.4
2008	4263564
2009	4647933.2
2010	4909623.6
2011	5067080.21
2012	5028378.33
2013	5055827.5
2014	4830713.879999999
2015	5150341.23
2016	5339970.470000001
2017	5571125.58
2018	5824748.67
2019	5908649.7700000005
2020	5848447.6499999985
2021	5893831.92
2022	5683752.98