Year	metric tons
1960	8100
1961	8700
1962	7500
1963	8800
1964	10600
1965	9700
1966	10109
1967	9927
1968	12464
1969	12905
1970	9833
1971	10365
1972	13204
1973	13805
1974	13512
1975	14599
1976	14578
1977	16728
1978	11627
1979	9932
1980	9636
1981	14190
1982	12881
1983	18000
1984	20000
1985	20099
1986	18684
1987	20472
1988	25951
1989	25951
1990	26400
1991	29500
1992	30200
1993	18609
1994	24500
1995	25111
1996	27700
1997	28680
1998	29791
1999	33711
2000	35795
2001	35460
2002	32709
2003	35436
2004	35131
2005	37920
2006	35867
2007	35628
2008	36813
2009	36503
2010	30751
2011	29037
2012	32261
2013	35208.13
2014	40109.69
2015	36971
2016	38293
2017	38799.77
2018	43361.34
2019	44719
2020	47700
2021	44787
2022	46110