Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	5
1969	15
1970	40
1971	54
1972	117
1973	180
1974	254
1975	329
1976	422
1977	515
1978	630
1979	755
1980	1150
1981	1530
1982	2100
1983	1459
1984	3275
1985	7708
1986	2706
1987	4174
1988	4958
1989	4869
1990	5226
1991	6866
1992	5504
1993	4862
1994	5903
1995	5771
1996	7724
1997	7931
1998	7175
1999	8788
2000	6596
2001	7551
2002	11532
2003	13621
2004	22114
2005	25981
2006	28393
2007	39531
2008	43120
2009	44317
2010	89021
2011	92200.35
2012	72292.85
2013	125692.89
2014	115271.42
2015	90976.46
2016	100187.15
2017	100458.36
2018	141224.38
2019	161278.62
2020	143829.72
2021	150817.59
2022	140930.63