Year	metric tons
1960	1177040
1961	1015286
1962	987739
1963	1115637
1964	1284686
1965	1434323
1966	1624474
1967	1636224
1968	1663695
1969	1885170
1970	1872439
1971	2200895
1972	2371815
1973	2225366
1974	2430751
1975	2636144
1976	2652117
1977	3414502
1978	3683799
1979	3648303
1980	3988044
1981	3967025
1982	4197280
1983	4701328
1984	5387166
1985	6210952
1986	6825517
1987	7708798
1988	8918031
1989	9765046
1990	10205589
1991	11619043
1992	14241777.9
1993	17550438.03
1994	20841586
1995	24017122
1996	26434973
1997	26613066
1998	28624635
1999	31369747.02
2000	33437798
2001	35197219.4
2002	37766374
2003	40126141
2004	43543316.7
2005	46533577.3
2006	49426532.89
2007	52328970.4
2008	55282892.78
2009	58626449.199999996
2010	62193569.1
2011	65284052.949999996
2012	70320494.16999999
2013	76597971.54
2014	80007821.43
2015	83531410.01
2016	86786694.49
2017	89244270.15
2018	91231079.34
2019	93478970.27
2020	95429465.02000001
2021	97370588.96999998
2022	100660991.02