Year	metric tons
1961	2274011
1962	2305937
1963	2229471
1964	2349312
1965	2019628
1966	2648957
1967	2934871
1968	3046205
1969	3406075
1970	3070552
1971	3545643
1972	3318492
1973	3787094
1974	4014005
1975	3704116
1976	4277716
1977	4203640
1978	4628713
1979	3982485
1980	4826198
1981	4356211
1982	5026041
1983	5075517
1984	5353319
1985	5551181
1986	5108350
1987	4964599
1988	5359343
1989	5009116
1990	5289752
1991	5044859
1992	4322590
1993	4206456
1994	4435935
1995	4451882
1996	4494851.92
1997	5010607.17
1998	4772664.73
1999	4809095.2
2000	4494383.16
2001	4837093.57
2002	4762611.9
2003	4269509.66
2004	5323713.99
2005	4907056.68
2006	4467510.5
2007	4766039.24
2008	5756463.63
2009	5164152.4
2010	4866648.45
2011	5712206.55
2012	4883379.22
2013	4599433.26
2014	5720308.58
2015	4853895.01
2016	5701697.09
2017	4874849.22
2018	4787200
2019	5399310
2020	5649770
2021	5316150
2022	5205750