Year	metric tons
1960	9200
1961	9700
1962	11500
1963	12500
1964	10400
1965	11000
1966	18500
1967	18200
1968	17300
1969	17000
1970	18310
1971	15230
1972	15735
1973	18640
1974	19276
1975	17598
1976	16504
1977	15157
1978	16206
1979	16971
1980	16082
1981	16301
1982	20202
1983	20764.6
1984	26289.6
1985	23917.9
1986	21487
1987	16908
1988	15250
1989	12633
1990	13348
1991	13099
1992	11551
1993	11654
1994	13661
1995	13727
1996	13510
1997	13338
1998	11439
1999	10518
2000	10483
2001	7785
2002	7796
2003	7109
2004	7579
2005	7837
2006	11676
2007	8025
2008	5141
2009	5688
2010	5230.87
2011	5953.79
2012	6201.31
2013	7211.11
2014	6695.32
2015	8161.3
2016	7346.35
2017	6943.81
2018	7011.4
2019	7249.08
2020	5184.4400000000005
2021	5549.88
2022	4952.61