Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	3
1967	9
1968	18
1969	26
1970	68
1971	118
1972	197
1973	314
1974	401
1975	515
1976	662
1977	811
1978	985
1979	1192
1980	1433
1981	1714
1982	2041
1983	2271
1984	1997
1985	3265
1986	4162
1987	5435
1988	5125
1989	6836
1990	9258
1991	10314
1992	10645
1993	9532
1994	9663
1995	9918
1996	10649
1997	11977
1998	12866
1999	13028
2000	15023
2001	16570
2002	17100
2003	17680
2004	20000
2005	22480
2006	25409
2007	26679
2008	27250
2009	26730
2010	28230
2011	30950
2012	34500
2013	36020
2014	43400
2015	48000
2016	49043
2017	56157.1
2018	65864
2019	71252
2020	76822
2021	84291
2022	87385