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	0
1985	0
1986	5
1987	17
1988	20
1989	20
1990	15
1991	15
1992	12
1993	10
1994	116
1995	36
1996	4
1997	0
1998	0
1999	0
2000	0
2001	0
2002	2247
2003	5639
2004	1366
2005	1782
2006	1198
2007	1528
2008	1392
2009	720
2010	864
2011	796
2012	604
2013	721
2014	1179
2015	1133
2016	1180
2017	1835
2018	2659
2019	2468
2020	3327
2021	4143
2022	5539