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	4773
1993	3002
1994	3133
1995	2956
1996	3236
1997	3284
1998	3137
1999	3233
2000	3037
2001	3089
2002	2975
2003	2635
2004	2594
2005	2573
2006	2502.17
2007	2464.45
2008	2196.71
2009	2341.8599999999997
2010	1719.4
2011	2287.21
2012	1639.49
2013	1625.92
2014	1806.8
2015	1960.5900000000001
2016	2169.2200000000003
2017	2030.1699999999998
2018	2207.24
2019	2425.26
2020	1984.62
2021	1954.7
2022	1915.96