Year	metric tons
1960	3500
1961	4000
1962	4300
1963	4500
1964	5000
1965	6000
1966	7300
1967	7500
1968	10000
1969	10000
1970	9111
1971	10921
1972	10942
1973	11333
1974	11150
1975	14420
1976	12820
1977	10847
1978	15363
1979	8096
1980	9134
1981	10325
1982	14530
1983	14878
1984	14715
1985	15574
1986	14838
1987	15189
1988	15469
1989	16458
1990	15800
1991	12524
1992	10899
1993	17114
1994	13202
1995	12221
1996	15119
1997	14310
1998	16702
1999	22944
2000	22297
2001	23183
2002	20976
2003	27515
2004	28048
2005	27756
2006	24880
2007	19955
2008	22872
2009	27132
2010	27635
2011	24142
2012	19340
2013	20038
2014	19874
2015	21555
2016	31989
2017	27047
2018	24910
2019	26526
2020	18764
2021	18866
2022	22656.22