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	1045
1993	580
1994	228
1995	157
1996	101
1997	61
1998	96
1999	83
2000	86
2001	80
2002	52
2003	56
2004	72
2005	107
2006	150
2007	180
2008	422
2009	705
2010	850
2011	1000
2012	1155
2013	1305
2014	1495
2015	1655
2016	1805
2017	2042
2018	2381.5
2019	2444.7
2020	2026.9
2021	2790.4
2022	2743.2