Year	metric tons
1960	1900
1961	900
1962	200
1963	100
1964	601
1965	202
1966	204
1967	318
1968	365
1969	427
1970	480
1971	531
1972	924
1973	1172
1974	2327
1975	2517
1976	3476
1977	3932
1978	5645
1979	7377
1980	7980
1981	13042
1982	15329
1983	22712
1984	25453
1985	34617
1986	49392
1987	55379
1988	88268
1989	115191
1990	150583
1991	160705
1992	131102
1993	164499
1994	218486
1995	277615
1996	321516
1997	367617
1998	410757
1999	475932
2000	491329
2001	510748
2002	551300
2003	584422
2004	636802
2005	661877
2006	712373
2007	841560
2008	848359
2009	961839.85
2010	1019801.94
2011	1143893.34
2012	1321119.2
2013	1247865.08
2014	1332497.02
2015	1380890.06
2016	1326216.18
2017	1308633.8
2018	1355116.8
2019	1453042.39
2020	1490412.05
2021	1665112.05
2022	1648468.71