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	642
1993	223
1994	163
1995	207
1996	185
1997	168
1998	162
1999	71
2000	58
2001	144
2002	94
2003	12
2004	20
2005	20
2006	20
2007	107
2008	92
2009	133
2010	352
2011	394.5
2012	297
2013	300
2014	577.93
2015	1068.4
2016	1930.7
2017	2100
2018	2558.7
2019	4300
2020	5100
2021	10300
2022	20698.3