Year	metric tons
1960	1600
1961	1500
1962	1600
1963	1700
1964	1900
1965	2950
1966	3800
1967	2950
1968	2750
1969	2350
1970	2750
1971	2950
1972	3300
1973	4400
1974	4663
1975	4693
1976	4750
1977	5327
1978	5114
1979	5765
1980	7119
1981	7631.79
1982	7737.04
1983	8548.15
1984	8430.07
1985	11164.82
1986	8653.9
1987	10520.03
1988	10464.66
1989	9788.61
1990	9709.18
1991	11889.54
1992	12205.54
1993	13695.94
1994	14927.02
1995	13245.48
1996	14099.15
1997	14719.59
1998	14577.69
1999	13667
2000	15527
2001	13671
2002	15675
2003	16724
2004	15164
2005	15555
2006	16242
2007	10912
2008	14813
2009	13809.83
2010	16342.44
2011	15313
2012	16756.83
2013	12765
2014	11878.22
2015	11307.29
2016	11625
2017	11479.94
2018	10998.69
2019	10145.91
2020	7433.16
2021	8704.85
2022	9345.22