Year	metric tons
1960	400
1961	400
1962	400
1963	500
1964	500
1965	500
1966	500
1967	500
1968	400
1969	500
1970	600
1971	300
1972	300
1973	200
1974	283
1975	549
1976	379
1977	581
1978	698
1979	547
1980	500
1981	500
1982	500
1983	480
1984	480
1985	483
1986	599
1987	703
1988	4647
1989	5820
1990	9022
1991	8167
1992	2171
1993	2240
1994	3922
1995	1033
1996	989
1997	6145
1998	34108
1999	17804
2000	22799
2001	31944
2002	46076
2003	37767
2004	78315
2005	44104
2006	51584
2007	63309
2008	55898
2009	59587
2010	66367
2011	76576
2012	10156.27
2013	39499.91
2014	81332.54
2015	26132.99
2016	22833.71
2017	32937.79
2018	2327.89
2019	1968.79
2020	2127.52
2021	1586.28