Year	metric tons
1961	6174805
1962	6829499
1963	6478872
1964	6918522
1965	7495221
1966	7621221
1967	7933082
1968	8453829
1969	9711470
1970	7640260
1971	9818933
1972	10803835
1973	11698511
1974	12468716
1975	12225960
1976	11347383
1977	12335895
1978	13385358
1979	12103387
1980	14009190
1981	12889433
1982	14919042
1983	13764913
1984	15730515
1985	14808816
1986	14301241
1987	14168185
1988	14966140
1989	15416584
1990	12561481
1991	15832169
1992	10011896
1993	8548410
1994	11748979.46
1995	11298996
1996	11343967
1997	14139126
1998	13037591
1999	11392048
2000	10036050
2001	15045901
2002	11703295
2003	8769586
2004	16779323
2005	16212463
2006	14467371
2007	9652899
2008	16840650
2009	13590362
2010	12269359
2011	13678147
2012	10372740
2013	13609910
2014	16613380
2015	14145172
2016	16643885
2017	14017280
2018	14885530
2019	15650010
2020	15566640
2021	13980870
2022	9060660