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	9393
1996	12943
1997	10050
1998	9850
1999	10623
2000	11730
2001	11230
2002	11207
2003	13642
2004	14497
2005	11858
2006	15595
2007	15014
2008	14178
2009	16358
2010	13493.19
2011	9918.42
2012	27092.72
2013	19274
2014	18389.7
2015	16506.05
2016	17314.21
2017	18520.95
2018	21092.05
2019	18315.97
2020	17248
2021	17051.02
2022	19892.55