Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	1
1966	3
1967	8
1968	16
1969	24
1970	47
1971	79
1972	119
1973	155
1974	203
1975	232
1976	265
1977	309
1978	394
1979	489
1980	599
1981	682
1982	839
1983	2463
1984	6240
1985	6402
1986	10331
1987	11012
1988	10433
1989	8549
1990	4968
1991	6277
1992	6402
1993	5970
1994	6538
1995	4981
1996	5364
1997	7185
1998	7536
1999	6268
2000	7537
2001	8209
2002	8288
2003	8033
2004	6700
2005	6696
2006	7894
2007	7416
2008	7352
2009	6728.1
2010	8224.58
2011	9165.39
2012	10317.8
2013	10067.21
2014	11338.95
2015	9562.88
2016	9787.24
2017	12508.74
2018	13991.17
2019	13690.77
2020	20583.01
2021	19516.48
2022	20968