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	8080
1991	24970
1992	21230
1993	17680
1994	24590
1995	39170
1996	47740
1997	36670
1998	43050
1999	36670
2000	67832
2001	102401
2002	132171
2003	115499
2004	95348
2005	96830
2006	101178
2007	108430
2008	132439
2009	128075.95
2010	150847
2011	159157
2012	180695.79
2013	141156.77000000002
2014	165902.59
2015	201339.94
2016	145052.22999999998
2017	144872.46000000002
2018	139711.22
2019	133380
2020	125972
2021	142129
2022	159271