Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	10
1970	19
1971	27
1972	50
1973	93
1974	158
1975	286
1976	433
1977	780
1978	1132
1979	1687
1980	3737
1981	5794
1982	7586
1983	9168
1984	10700
1985	10873
1986	10990
1987	13140
1988	15559
1989	18170
1990	20490
1991	23390
1992	29820
1993	30390
1994	30915
1995	46202
1996	77690
1997	87676
1998	103915
1999	140657
2000	172450
2001	205568
2002	247678
2003	273268
2004	269699
2005	257784
2006	271697
2007	289048
2008	331553
2009	365127
2010	411777
2011	436084
2012	480880
2013	477634.46
2014	564221.57
2015	578372.92
2016	542982.01
2017	565196.44
2018	581637.72
2019	600600.1
2020	630800.2
2021	650572.21
2022	738881