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	0
1987	2
1988	2
1989	2
1990	6
1991	1
1992	17
1993	36
1994	72
1995	103
1996	119
1997	157
1998	172
1999	194
2000	113
2001	99
2002	157
2003	160
2004	709
2005	454
2006	475
2007	622
2008	473
2009	433
2010	499.98
2011	530
2012	550
2013	560.85
2014	711.07
2015	983.14
2016	947.63
2017	1632
2018	1245.99
2019	933.18
2020	3500.03
2021	4767.92
2022	5020