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	1185
1994	1627
1995	1950
1996	1414
1997	1364
1998	1361
1999	1396
2000	1368
2001	1531
2002	1746
2003	1646
2004	1603
2005	1693
2006	1718
2007	1994
2008	1655
2009	1761
2010	1608
2011	1935
2012	1945
2013	1986
2014	1944
2015	1971
2016	1866
2017	1870
2018	1937
2019	1853
2020	1736
2021	1815
2022	1895