Year	metric tons
1960	5700
1961	7400
1962	7900
1963	9200
1964	10400
1965	12000
1966	12300
1967	13900
1968	16000
1969	16600
1970	17400
1971	15500
1972	17600
1973	19000
1974	23617
1975	20123
1976	20956
1977	31907
1978	35978
1979	35288
1980	31530
1981	32798
1982	32794
1983	35380
1984	37256
1985	37606
1986	37395
1987	36785
1988	36523
1989	35339
1990	36922
1991	40806
1992	41337
1993	44263
1994	46577
1995	48130
1996	48833
1997	54268
1998	53140
1999	54450
2000	49492
2001	54013
2002	48625
2003	60303
2004	57327
2005	53978
2006	54423
2007	48108
2008	42460
2009	44115.96
2010	45675.6
2011	43448.1
2012	54105.18
2013	49488.65
2014	38113.49
2015	36975.64
2016	42478.7
2017	43673.27
2018	41694.76
2019	39330.02
2020	40124.53
2021	34357.98
2022	37206.85