Year	metric tons
1960	40000
1961	45000
1962	45000
1963	45000
1964	50000
1965	55000
1966	60000
1967	60000
1968	65000
1969	65000
1970	70000
1971	70000
1972	70000
1973	70000
1974	75000
1975	75000
1976	75000
1977	80000
1978	75000
1979	70000
1980	60000
1981	55000
1982	30000
1983	40000
1984	50000
1985	55000
1986	60000
1987	70000
1988	58000
1989	64400
1990	70000
1991	60000
1992	80000
1993	87300
1994	80000
1995	90000
1996	100000
1997	85000
1998	51300
1999	59600
2000	83200
2001	75000
2002	70000
2003	71000
2004	74000
2005	77000
2006	79000
2007	82000
2008	85030
2009	88030
2010	91030
2011	95030
2012	100030
2013	120060
2014	120080
2015	100154
2016	110094
2017	107150
2018	107105
2019	107105
2020	105105
2021	103110
2022	107120