Year	metric tons
1960	1500
1961	1500
1962	1500
1963	1800
1964	1800
1965	2000
1966	2500
1967	2800
1968	3000
1969	3300
1970	3500
1971	3600
1972	3700
1973	3800
1974	3900
1975	4000
1976	4084
1977	4837
1978	4000
1979	3801
1980	5115
1981	5747
1982	5594
1983	4812
1984	5599
1985	7763
1986	8057
1987	7842
1988	6736
1989	9207
1990	8105
1991	7553
1992	7983
1993	8958
1994	7628
1995	9389
1996	12940
1997	10050
1998	9849
1999	10620
2000	11718
2001	11230
2002	11204
2003	13638
2004	14489
2005	11855
2006	15593
2007	15013
2008	14176
2009	16356
2010	13490
2011	9915
2012	27091
2013	19274
2014	18384
2015	16500.05
2016	17300
2017	18499.95
2018	21071.05
2019	18279.97
2020	17202
2021	17000.02
2022	19836.55