Year	metric tons
1961	6936974
1962	7803006
1963	7952501
1964	8664696
1965	8227347
1966	6833424
1967	7957755
1968	8200906
1969	8127052
1970	8305587
1971	8320493
1972	7488512
1973	8739541
1974	8733016
1975	9391721
1976	9500779
1977	9693499
1978	10770027
1979	10705395
1980	13680630
1981	14571071
1982	14838886
1983	15024136
1984	14960176
1985	15066662
1986	14861999
1987	14220309
1988	13647252
1989	14259141
1990	14423776
1991	13661934
1992	15324551
1993	17219677
1994	18692538
1995	18456300
1996	18199400
1997	17386500
1998	17774500
1999	20928000
2000	22118200
2001	22856400
2002	22844449
2003	24311061
2004	26039773
2005	29172696
2006	32502379
2007	33122008
2008	34320428
2009	34522607
2010	34557652
2011	31094385
2012	28762652.42
2013	29045647.27
2014	29218917.6
2015	29055197.68
2016	28521820.27
2017	28500083.54
2018	30463881.13
2019	29104082.45
2020	28876008.93
2021	30150225.35
2022	27209802.06