Year	metric tons
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	3
1969	5
1970	8
1971	10
1972	20
1973	24
1974	9
1975	28
1976	32
1977	27
1978	131
1979	225
1980	220
1981	413
1982	505
1983	780
1984	776
1985	3109
1986	3148
1987	3415
1988	3687
1989	2472
1990	1830
1991	884.95
1992	136.6
1993	787
1994	1235
1995	1961
1996	3417
1997	3616
1998	6148
1999	6343
2000	7996
2001	9251
2002	13633
2003	21809
2004	9630
2005	10078
2006	14576
2007	23234
2008	15747
2009	13651
2010	20303
2011	35457
2012	26862
2013	33254
2014	53636
2015	9312
2016	5257
2017	6103
2018	11217
2019	31382
2020	31395
2021	28612.01
2022	26675.45