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	0
1974	9
1975	9
1976	9
1977	12
1978	14
1979	14
1980	13
1981	11
1982	10
1983	6
1984	366
1985	615
1986	789
1987	1096
1988	1376
1989	2037
1990	3613
1991	4882
1992	4288
1993	4021
1994	4429
1995	3530
1996	3013
1997	4196
1998	5088
1999	4148
2000	2819
2001	2830
2002	4105
2003	6602
2004	5954
2005	5895
2006	6037
2007	5669
2008	5421
2009	4982
2010	5147.6
2011	5343.28
2012	5926.53
2013	6613
2014	7222
2015	6730.4
2016	8094.27
2017	6338.32
2018	7991.55
2019	9224.32
2020	9753.01
2021	10346.65
2022	11355.02