Year	metric tons
1960	49489
1961	50134
1962	47215
1963	48146
1964	42657
1965	46607
1966	54118
1967	59171
1968	57851
1969	49243
1970	58803
1971	64900
1972	56168
1973	64184
1974	67502
1975	63005
1976	68979
1977	77826
1978	97889
1979	117386
1980	154365
1981	167304
1982	169149
1983	195627
1984	207998
1985	202984
1986	208170
1987	240969
1988	276804
1989	316107
1990	351703
1991	386324
1992	470251
1993	433017
1994	452590
1995	556723
1996	425441
1997	648917
1998	648029.1
1999	600188
2000	553459
2001	569836
2002	588649
2003	550929
2004	546072
2005	545460.01
2006	476798.01
2007	494692.01
2008	452534.33
2009	439762.4
2010	436593.37
2011	430337.99
2012	441930.24
2013	444067.29
2014	442371.72
2015	433812.3
2016	424940.96
2017	431143.14
2018	408010.8
2019	412627.86
2020	364964.03
2021	343507.1
2022	346317.57