Year	metric tons
1960	80
1961	80
1962	90
1963	100
1964	110
1965	120
1966	230
1967	144
1968	183
1969	201
1970	183
1971	212
1972	258
1973	370
1974	443
1975	543
1976	736
1977	818
1978	1093
1979	1514
1980	2088
1981	2789
1982	5316
1983	1972
1984	8611
1985	7497
1986	9941
1987	13936
1988	32349
1989	51510
1990	70464
1991	105258
1992	116281
1993	135090
1994	183747
1995	206266
1996	323115
1997	375113
1998	361430
1999	305494
2000	425058
2001	631634
2002	617303
2003	607338
2004	696157
2005	739368
2006	832329
2007	806166
2008	870845
2009	881084
2010	713241
2011	969539
2012	1075547
2013	1045718
2014	1227359
2015	1057742
2016	1050117
2017	1219747.1
2018	1287232.58
2019	1407289
2020	1505486
2021	1443520
2022	1524149