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	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	28
1985	0
1986	0
1987	6
1988	5
1989	3
1990	5
1991	6
1992	8
1993	10
1994	13
1995	13
1996	13
1997	13
1998	13
1999	13
2000	15
2001	15
2002	6
2003	400
2004	1711.2
2005	2608.8
2006	1353.6
2007	866.6
2008	1160.2
2009	4029.8
2010	7105
2011	7218.6
2012	6992.4
2013	11815
2014	12165.4
2015	12203
2016	10586.5
2017	4786.5
2018	5526.5
2019	5607
2020	5507
2021	12463.74
2022	11879.3