Year	metric tons
1960	2013
1961	1700
1962	1500
1963	1400
1964	1600
1965	2924
1966	3324
1967	4236
1968	5560
1969	6500
1970	5500
1971	5600
1972	2549
1973	2975
1974	4769
1975	4949
1976	4059
1977	2046
1978	4355
1979	4500
1980	12752
1981	13130
1982	14706
1983	10122
1984	11979.78
1985	15900.6
1986	17947
1987	18592
1988	21660
1989	22008
1990	24734
1991	26036
1992	28828
1993	31093
1994	33508
1995	34408
1996	35984
1997	36885
1998	37919
1999	43603
2000	49969
2001	47296
2002	44013
2003	41834
2004	39902
2005	37395
2006	34652
2007	31926
2008	47650
2009	52117.3
2010	50006
2011	30004
2012	34654
2013	35504
2014	24633
2015	25730
2016	29919.39
2017	31873.99
2018	32144.06
2019	32335
2020	31803.55
2021	31951.33
2022	32585