Year	metric tons
1960	651576
1961	674920
1962	654311
1963	689299
1964	709330
1965	745249
1966	799698
1967	810052
1968	829986
1969	750969
1970	752458
1971	761294
1972	725937
1973	764694
1974	747194
1975	714393
1976	713101
1977	656550
1978	696895.3
1979	649366.3
1980	652110.9
1981	673271.88
1982	668074.64
1983	687885.47
1984	677794.54
1985	695266.4
1986	716684.58
1987	694891.48
1988	741153.08
1989	719597.4
1990	699221.8
1991	657306.5
1992	668299.5
1993	680185.5
1994	703920.6
1995	688459.3
1996	643217.9
1997	642478.5
1998	610416.5
1999	657039.8
2000	694452.6
2001	671905.7
2002	701925
2003	709038.7
2004	664898.2
2005	598482.8
2006	595153.9
2007	553685.7
2008	500162.8
2009	440199.3
2010	452243.5
2011	502006.02
2012	473308.8
2013	540519.91
2014	548074.9
2015	541788.04
2016	558484.89
2017	554362.3
2018	578656.4
2019	524109.56
2020	478461.6
2021	510779.44
2022	534875.51