Year	metric tons
1960	900
1961	900
1962	1000
1963	800
1964	4100
1965	5100
1966	4400
1967	6800
1968	5900
1969	5800
1970	5600
1971	5300
1972	4600
1973	4900
1974	5800
1975	6188
1976	6250
1977	8134
1978	7767
1979	10042
1980	11500
1981	12720
1982	14636
1983	12919
1984	14571
1985	10560
1986	12138
1987	12647
1988	12141
1989	11615
1990	7849
1991	7798
1992	8132
1993	7897
1994	6100
1995	4615
1996	4727
1997	5437
1998	4252
1999	7780
2000	3654
2001	2938
2002	2308
2003	4465
2004	2489
2005	3145
2006	3257
2007	4032
2008	5157
2009	6722.52
2010	7920.63
2011	5527.15
2012	5975.06
2013	12151.65
2014	11171.79
2015	13536.54
2016	15817.76
2017	15568.75
2018	15913.99
2019	16500.79
2020	15051.79
2021	15173.62
2022	9510.78