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	7728
1993	4358
1994	3095
1995	3611
1996	2200
1997	3075
1998	2799
1999	2908
2000	3306
2001	3400
2002	2600
2003	2100
2004	1900
2005	2900
2006	3400
2007	3100
2008	3800
2009	4100
2010	4078
2011	8513
2012	11052
2013	13670
2014	17116
2015	22956
2016	27267
2017	31450
2018	33600
2019	40000
2020	46100.02
2021	53000.01
2022	54999.98