Year	metric tons
1961	5176370
1962	5239880
1963	5135570
1964	5305080
1965	5452464
1966	5583972
1967	6179853
1968	6177456
1969	7472275
1970	7595768
1971	7374862
1972	6459350
1973	7421393
1974	8146691
1975	8839298
1976	9327624
1977	10083284
1978	10313167
1979	10834585
1980	10775175
1981	11215910
1982	11670615
1983	10647242
1984	11269139
1985	12727856
1986	13337939
1987	12818171
1988	13399121
1989	13981140
1990	14987250
1991	14332247.29
1992	13750626.86
1993	14235789.18
1994	15062259.56
1995	14673161.82
1996	15439998.41
1997	15604612.06
1998	12385313.93
1999	16372330.55
2000	16901159.42
2001	17480298.91
2002	17590069.12
2003	18115689.95
2004	19910353
2005	19856348
2006	21408902.02
2007	22977304
2008	23744012
2009	23300701
2010	22149369
2011	23655648
2012	25440477.82
2013	25817440.51
2014	26739121.85
2015	25669246.05
2016	24846678.08
2017	27191819.46
2018	26838576.91
2019	26794250.87
2020	27413962.2
2021	28261089.87
2022	28012590.81