Year	metric tons
1960	500
1961	500
1962	600
1963	600
1964	1866
1965	3370
1966	3386
1967	4106
1968	5756
1969	5462
1970	8882
1971	2943
1972	2319
1973	3150
1974	7608
1975	7069
1976	6136
1977	4883
1978	10602
1979	6699
1980	7516
1981	10276
1982	5053
1983	1041
1984	1037
1985	1204
1986	1132
1987	1187
1988	1268
1989	1350
1990	1077
1991	1094
1992	1501
1993	1238.64
1994	1088
1995	1417.09
1996	1070.45
1997	913
1998	952
1999	961
2000	1273
2001	1086
2002	1031
2003	1051
2004	1084
2005	1435.9
2006	972
2007	1159.82
2008	1188.2
2009	1075.88
2010	992.11
2011	1023.7800000000001
2012	940.91
2013	906.9
2014	893.33
2015	874.19
2016	841.8
2017	3463.7
2018	3906.4199999999996
2019	3949.95
2020	791
2021	835.2
2022	823.07