Year	metric tons
1960	19810
1961	16670
1962	12520
1963	12680
1964	13830
1965	14490
1966	19950
1967	20600
1968	22160
1969	19814
1970	23477
1971	20636
1972	25103
1973	29169
1974	35783
1975	39380
1976	44071
1977	36230
1978	35893
1979	25703
1980	38789
1981	35543
1982	52616
1983	70965
1984	97785
1985	61134
1986	70235
1987	66828
1988	72005
1989	66618
1990	64435
1991	74692
1992	96654
1993	69500
1994	48852
1995	64096
1996	83237
1997	65433
1998	73020
1999	79567
2000	65891
2001	53409
2002	49852
2003	74280
2004	57233
2005	44685
2006	35379
2007	44994
2008	43977
2009	38907
2010	40694
2011	39141
2012	26360
2013	25289
2014	26032
2015	29909
2016	41801
2017	35979
2018	34196
2019	40756
2020	32258
2021	32649
2022	26545