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	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	1229
1996	2493
1997	3791
1998	3625
1999	3650
2000	2623
2001	1950
2002	2379
2003	1507
2004	2951
2005	1814
2006	2323
2007	2702
2008	2843
2009	1525
2010	1699
2011	1318
2012	2091
2013	1930
2014	2854
2015	3227
2016	3306
2017	3208
2018	3201
2019	3943
2020	4661.9
2021	4660.7
2022	4195