Year	metric tons
1961	17982
1962	12049
1963	12349
1964	16227
1965	16227
1966	13139
1967	11938
1968	7575
1969	8129
1970	5961
1971	5734
1972	5689
1973	5103
1974	5054
1975	5254
1976	5027
1977	5627
1978	5615
1979	6005
1980	5950
1981	6525
1982	6480
1983	6363
1984	4933
1985	5286
1986	5719
1987	2667
1988	1910
1989	780
1990	540
1991	500
1992	460
1993	428
1994	550
1995	660
1996	750
1997	820
1998	1012
1999	700
2000	450
2001	309.45
2002	201.76
2003	159.59
2004	126.41
2005	110.5
2006	175.21
2007	144.74
2008	73.68
2009	59.72
2010	46.36
2011	33.71
2012	11
2013	18.09
2014	58.87
2015	305.99
2016	130.43
2017	170.15
2018	206.15
2019	172
2020	180.6
2021	184.11
2022	196.24