Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	4
1967	10
1968	20
1969	106
1970	254
1971	282
1972	402
1973	428
1974	343
1975	345
1976	510
1977	638
1978	714
1979	788
1980	989
1981	1138
1982	1387
1983	1794
1984	2907
1985	2839
1986	4285
1987	5878
1988	6965
1989	7697
1990	16664
1991	34997
1992	36916
1993	37422
1994	46495
1995	62486
1996	75786
1997	68010
1998	72304
1999	70004
2000	90371
2001	130605
2002	173065
2003	162527
2004	139343
2005	172302.15
2006	212289.2
2007	241078.7
2008	263596.25
2009	268125.31
2010	314846.79999999993
2011	344257.7
2012	402600.65
2013	385174.67000000004
2014	445655.14
2015	499395.14999999997
2016	455718.15
2017	483267.49000000005
2018	490083.18
2019	475835.73000000004
2020	516465.68999999994
2021	599142.49
2022	647405.2000000001