Year	metric tons
1961	7891000
1962	8324000
1963	8203000
1964	8105000
1965	8413000
1966	6140000
1967	7375000
1968	7408000
1969	8799000
1970	8981000
1971	8328000
1972	5809000
1973	8243000
1974	10285000
1975	8348000
1976	7161000
1977	6957000
1978	6004000
1979	6439000
1980	7788000
1981	8053000
1982	8468000
1983	8828000
1984	10503000
1985	11889000
1986	14661322
1987	15917000
1988	16560000
1989	18007000
1990	17678000
1991	18615000
1992	19597000
1993	20090600
1994	20373200
1995	22512600
1996	21665000
1997	21853000
1998	22040000
1999	22405000
2000	21370000
2001	20090000
2002	21373000
2003	22736000
2004	24321000
2005	26031000
2006	28864000
2007	27171000
2008	30209000
2009	21267630
2010	24650297.14
2011	20699525.8
2012	21427122.03
2013	19617693.18
2014	26311554
2015	25682666.24
2016	30235944.48
2017	30156613.73
2018	30645842.17
2019	29795814.94
2020	29210106.83
2021	29913046.35
2022	30392680