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	17
1984	17
1985	27
1986	36
1987	48
1988	74
1989	74
1990	74
1991	74
1992	60
1993	326
1994	1068
1995	2310
1996	2504
1997	3486
1998	4790
1999	4205
2000	5435
2001	5750
2002	6089
2003	7005
2004	7880
2005	9983
2006	11220
2007	11533
2008	16078
2009	18943
2010	16972
2011	15766
2012	24351
2013	26406.9
2014	30566
2015	24536
2016	21182
2017	24899
2018	29473.4
2019	29523.3
2020	29489
2021	31005.9
2022	31568.5