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	70172
1978	68878
1979	81236
1980	81085
1981	79818
1982	83101
1983	77397
1984	75581
1985	74099
1986	72104
1987	70773
1988	70966
1989	69967
1990	70848
1991	69392
1992	72032
1993	65307
1994	79070
1995	94188
1996	98587
1997	102067
1998	106867
1999	110067
2000	112159
2001	121181
2002	130465
2003	118186
2004	129395
2005	142747
2006	137667
2007	139158
2008	155846
2009	172546
2010	181570
2011	190571
2012	199840
2013	208195
2014	216575
2015	225955
2016	235505
2017	270592
2018	287453
2019	303861.82
2020	290138
2021	300138
2022	309153