Year	metric tons
1960	715544
1961	826519
1962	943737
1963	893708
1964	1088849
1965	1334477
1966	1394161
1967	1056533
1968	765650
1969	866513
1970	930651
1971	877856
1972	927877
1973	1126446
1974	1171712
1975	1212796
1976	1241264
1977	1639172
1978	1843413
1979	1935527
1980	1810097
1981	1755980.79
1982	1095509.04
1983	1181981.51
1984	1901988.81
1985	2066290.82
1986	2062362.08
1987	2067080.75
1988	2219142.73
1989	1965770.7
1990	2233390.35
1991	1762930.79
1992	2859971.46
1993	3177528.61
1994	2911428.3200000003
1995	2918294.98
1996	3303257.0500000003
1997	3537090.08
1998	3175286.8899999997
1999	3279671.6
2000	3461415.34
2001	3455147.36
2002	3895784.55
2003	3719878.02
2004	3629252.96
2005	3595704.04
2006	3224786.46
2007	3256275.2
2008	3068744.9
2009	2900745.33
2010	2966148.5300000003
2011	2944058.02
2012	3144454.58
2013	2993940.33
2014	2839706.4499999997
2015	3273159.6899999995
2016	3024418.35
2017	3210566.98
2018	3380858.4600000004
2019	3267777.8400000003
2020	3063193.49
2021	3296301.1999999997
2022	3450543.7800000003