Year	metric tons
1960	3555
1961	3853
1962	4081
1963	4397
1964	4740
1965	5003
1966	5294
1967	5605
1968	5881
1969	6206
1970	6549
1971	6913
1972	7255
1973	7699
1974	8112
1975	8641
1976	9187
1977	9734
1978	10293
1979	10839
1980	11503
1981	12176
1982	12917
1983	13842
1984	15699
1985	17793
1986	23305
1987	26122
1988	23669
1989	43196
1990	25527
1991	33333
1992	52495.9
1993	52940.03
1994	46152
1995	43550
1996	39276
1997	48216
1998	47844
1999	69788.02
2000	53847
2001	94704
2002	106439
2003	111683
2004	129234.5
2005	145916.47
2006	216538.24
2007	228647.39
2008	295391.04000000004
2009	309702.39
2010	369902.4
2011	413207.1
2012	454970.8
2013	501590
2014	544571.09
2015	552644.11
2016	545745.99
2017	546150.21
2018	553457.93
2019	584010.47
2020	581476.94
2021	607226.64
2022	607271.54