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	5
1972	10
1973	25
1974	40
1975	80
1976	51
1977	102
1978	305
1979	100
1980	222
1981	445
1982	360
1983	390
1984	513
1985	1620
1986	2520
1987	4523
1988	5260
1989	8131
1990	13076
1991	18283
1992	19098
1993	18752
1994	15332
1995	8611
1996	17584
1997	22538
1998	20436
1999	42544
2000	34823
2001	49167
2002	56102
2003	62746
2004	46077
2005	23455
2006	18574
2007	30699
2008	46673
2009	59295
2010	47575
2011	60473
2012	76564
2013	75909
2014	86454
2015	80622
2016	83333
2017	86866
2018	78975
2019	95085
2020	89055
2021	115760
2022	108745