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	3899
1993	2907
1994	1874
1995	1714
1996	1537
1997	1516
1998	1516
1999	1650
2000	1996
2001	2001
2002	1750
2003	2356
2004	2697
2005	2013
2006	2224
2007	3377
2008	3008
2009	3421.6
2010	3190.99
2011	3279.61
2012	3581.96
2013	4210.88
2014	3835.8
2015	4450.17
2016	4392.74
2017	3749.07
2018	3744.43
2019	4214.65
2020	4477.45
2021	5135.34
2022	4859.01