Year	metric tons
1960	100
1961	114
1962	121
1963	122
1964	84
1965	85
1966	105
1967	178
1968	246
1969	420
1970	1018
1971	1278
1972	1686
1973	3499
1974	4147
1975	6187
1976	6939
1977	9309
1978	12683
1979	16549
1980	25834
1981	34557
1982	48908
1983	65929
1984	65232
1985	69391
1986	81926
1987	117368
1988	130893
1989	134028
1990	154706
1991	194636
1992	228472
1993	210479
1994	228764
1995	272184
1996	322903
1997	382014
1998	415309
1999	455138
2000	431189
2001	479473
2002	561866
2003	631711
2004	681887
2005	756222
2006	849487.24
2007	871952.9400000001
2008	942461.4900000001
2009	1014427.12
2010	1129736.43
2011	1221738.36
2012	1280364.26
2013	1320942.2199999997
2014	1531954.4399999997
2015	1591611.4500000002
2016	1601816.5599999998
2017	1715706.31
2018	1893858.1999999995
2019	2145776.02
2020	2288564.0700000003
2021	2346260.75
2022	2723390.8200000003