Year	metric tons
1961	4203000
1962	4279000
1963	4304000
1964	4453700
1965	4561100
1966	4661400
1967	4726200
1968	4653200
1969	4931700
1970	5070300
1971	5232900
1972	5166300
1973	4370000
1974	4345300
1975	3808710
1976	4708090
1977	4380120
1978	3997360
1979	5203770
1980	6403227
1981	5610377
1982	5393494
1983	6718279
1984	5516819
1985	4239874
1986	4819987
1987	5707736
1988	6136960
1989	5733573
1990	6137530
1991	5810665
1992	5034885
1993	5304825
1994	5254031.58
1995	6751322
1996	9388992.55
1997	9484807
1998	7210329
1999	8392918
2000	8019830
2001	9585753
2002	9000335
2003	9532780
2004	10140082
2005	12749986
2006	12672350
2007	13252798.06
2008	14014121.48
2009	16457164.46
2010	18380017.41
2011	19269598.3
2012	20322264.7
2013	22338783.3
2014	24215411.4
2015	25837227.61
2016	26587343.15
2017	28763752.2
2018	28364293.66
2019	29672647.7
2020	30248749.18
2021	30602960.6
2022	31616415.5