Year	metric tons
1961	9149882
1962	11143648
1963	11812267
1964	13001568
1965	9684056
1966	16585035
1967	9873734
1968	18905065
1969	14250318
1970	12904533
1971	14840092
1972	10781927
1973	16997800
1974	16367969
1975	17767379
1976	17448064
1977	14417267
1978	25274482
1979	23343860
1980	16402312
1981	23703676
1982	14186565
1983	31068963
1984	28602111
1985	24942194
1986	24001774
1987	19899619
1988	21891006
1989	22375364
1990	23045332
1991	22682618
1992	19863778
1993	24099636
1994	27487013
1995	15699410
1996	27591195
1997	35990811.3
1998	30711400
1999	33644600
2000	35386938
2001	34717520.71
2002	38590113
2003	17553202
2004	42384121.8
2005	34357112
2006	40504980
2007	17771911
2008	26866214
2009	34140448.13
2010	33464873.64
2011	39973081.87
2012	43362426.46
2013	35589235.54
2014	38420401.88
2015	37195914.48
2016	35229824.87
2017	50049458.35
2018	33860810.45
2019	29236107.03
2020	26612704.79
2021	51077697.91
2022	56306820.81