Year	metric tons
1960	2600
1961	3200
1962	2800
1963	3000
1964	3000
1965	4000
1966	4000
1967	5000
1968	6000
1969	7000
1970	8000
1971	8000
1972	8000
1973	7997
1974	8455
1975	8415
1976	8377
1977	8336
1978	8807
1979	8740
1980	8661
1981	8921
1982	8812
1983	8653
1984	6809
1985	10191
1986	9757.2
1987	10766.4
1988	10827.3
1989	9357.4
1990	10054.6
1991	3012
1992	2696.2
1993	2500
1994	2100
1995	1380.3
1996	2126.2
1997	1013.8
1998	2683.5
1999	2747.9
2000	3328
2001	3311.2
2002	3656.8
2003	2801.6
2004	4549.5
2005	5000
2006	5652.3
2007	5413.4
2008	5365
2009	5811
2010	5132.2
2011	4805.2
2012	8605.2
2013	8973.09
2014	8705.05
2015	7855.1
2016	7862.09
2017	8563.2
2018	8648.3
2019	8711.5
2020	7627.16
2021	9641.5
2022	8739.5