Year	metric tons
1960	51700
1961	56500
1962	58100
1963	59400
1964	59800
1965	61100
1966	62600
1967	63400
1968	65100
1969	68100
1970	68800
1971	64700
1972	60400
1973	57600
1974	55736
1975	66280
1976	70397
1977	70167
1978	68867
1979	81214
1980	81045
1981	79761
1982	83012
1983	77277
1984	75299
1985	73969
1986	71980
1987	70636
1988	70799
1989	69829
1990	70742
1991	69318
1992	71975
1993	65257
1994	79020
1995	94131
1996	98529
1997	102000
1998	106800
1999	110000
2000	112109
2001	121031
2002	130135
2003	117801
2004	129000
2005	142345
2006	137232
2007	138612
2008	155300
2009	172000
2010	181000
2011	190000
2012	199000
2013	207000
2014	215000
2015	224000
2016	233190
2017	266737
2018	281945
2019	296953.82
2020	281630
2021	290330
2022	299035