Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	100
1974	82
1975	136
1976	113
1977	202
1978	193
1979	183
1980	148
1981	153
1982	112
1983	112
1984	152
1985	118
1986	181
1987	78
1988	123
1989	102
1990	42
1991	50
1992	60
1993	40
1994	132
1995	176
1996	225
1997	448
1998	610
1999	554
2000	851
2001	3677
2002	6949
2003	5099
2004	4051
2005	4029
2006	5367
2007	6537
2008	4442
2009	4962
2010	5140.78
2011	3607.12
2012	4391.96
2013	2861.43
2014	2446.77
2015	4377.95
2016	2272.27
2017	2337.88
2018	2048.42
2019	1454.78
2020	886.17
2021	1210.02
2022	1329.13