Year	metric tons
1960	1700
1961	2550
1962	2550
1963	2550
1964	3400
1965	4050
1966	2600
1967	4000
1968	5700
1969	5450
1970	5000
1971	5700
1972	5750
1973	4450
1974	3861
1975	5005
1976	4629
1977	5924
1978	6768
1979	8803
1980	6550
1981	6295
1982	7940
1983	11331
1984	9471
1985	11185
1986	22188
1987	25974
1988	20579
1989	17463
1990	16140
1991	27377
1992	23963
1993	24820
1994	14337
1995	25741
1996	21260
1997	23780
1998	15468
1999	22569
2000	17915
2001	22292
2002	15789
2003	17343
2004	17569
2005	21139
2006	22546
2007	16636
2008	14160
2009	12408
2010	12075
2011	10214
2012	11202
2013	12809
2014	9574
2015	12841
2016	13074
2017	11652
2018	12123
2019	11947
2020	15846
2021	21680
2022	20193