Year	metric tons
1960	9200
1961	5300
1962	7200
1963	10600
1964	9700
1965	20200
1966	16600
1967	12300
1968	15000
1969	15600
1970	13300
1971	16900
1972	7500
1973	8500
1974	10982
1975	14547
1976	20333
1977	18900
1978	15682
1979	11250
1980	14767
1981	11880
1982	12131
1983	11366
1984	11361
1985	11369
1986	11840
1987	12009
1988	11677
1989	10762
1990	17395
1991	20994
1992	24073
1993	17000
1994	22000
1995	21101
1996	3041
1997	20296
1998	13426
1999	9199
2000	17315
2001	8964
2002	11000
2003	14697
2004	13855
2005	13400
2006	12978
2007	11309
2008	18265
2009	12615
2010	17305
2011	10654
2012	12309
2013	13232
2014	16054
2015	20120
2016	21805
2017	18999
2018	20310
2019	20372
2020	19589
2021	19550
2022	19935