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	2773
1994	3488
1995	3567
1996	2368
1997	2618
1998	2009
1999	2268
2000	2255
2001	2530
2002	2575
2003	2527
2004	2783
2005	2648
2006	2981
2007	3193
2008	2726
2009	2595.9
2010	2310.4
2011	2769.5
2012	3255.56
2013	3092.2
2014	3174.66
2015	3279.63
2016	4034.65
2017	4516.26
2018	4161.41
2019	4540.54
2020	4032
2021	4329
2022	4509