Year	metric tons
1960	1182276
1961	1021573
1962	995295
1963	1124866
1964	1296096
1965	1448466
1966	1642315
1967	1660914
1968	1703913
1969	1941014
1970	1944182
1971	2289028
1972	2477078
1973	2348823
1974	2573889
1975	2801752
1976	2845006
1977	3638066
1978	3941805
1979	3946264
1980	4335343
1981	4371379
1982	4668197
1983	5250711
1984	6081966
1985	6955852
1986	7680617
1987	8788798
1988	10008031
1989	10965046
1990	11105589
1991	12569043
1992	15341777.9
1993	18680438.03
1994	21658625
1995	24755439
1996	27217448
1997	27102387
1998	29106135
1999	31851247.02
2000	33905498
2001	35705314
2002	38274469
2003	40634236
2004	44051421.7
2005	47041752.3
2006	49934712.09
2007	52837220.4
2008	55791442.78
2009	59135109.199999996
2010	62703354.1
2011	65793852.949999996
2012	70831103.17
2013	77109646.44
2014	80575366.13
2015	84099159.71000002
2016	87406444.19
2017	89869329.85000001
2018	91910138.84
2019	94158529.97
2020	96109764.52
2021	98051148.47
2022	100660990.52