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	2
1975	9
1976	14
1977	23
1978	36
1979	55
1980	86
1981	127
1982	190
1983	268
1984	581
1985	465
1986	985
1987	2049
1988	2845
1989	3318
1990	3401
1991	4175
1992	5707
1993	8341
1994	8990
1995	7241
1996	10295
1997	9472
1998	8080
1999	8789
2000	10053
2001	13386
2002	16957
2003	23547
2004	27036
2005	49249
2006	55356
2007	54689
2008	47080
2009	28858
2010	27509
2011	50295
2012	52436
2013	53100
2014	61750
2015	55100
2016	54000
2017	64500
2018	65000
2019	68100
2020	71151.1
2021	63267.8
2022	73193