Year	metric tons
1960	35
1961	135
1962	35
1963	35
1964	200
1965	300
1966	200
1967	200
1968	200
1969	200
1970	444
1971	516
1972	213
1973	401
1974	556
1975	876
1976	690
1977	585
1978	888
1979	2351
1980	2855
1981	4049
1982	11987
1983	11684
1984	17612
1985	20104
1986	24013
1987	29435
1988	36392
1989	49316
1990	50044
1991	60887
1992	56824
1993	68774
1994	85701
1995	93838
1996	109901
1997	129715
1998	137421
1999	154800
2000	152485
2001	170516
2002	179036
2003	181838
2004	207203
2005	172813
2006	171848
2007	174200
2008	175702
2009	196597.82
2010	201363.85
2011	198967.6
2012	205594.7
2013	225762.18
2014	234368.63
2015	223037.58
2016	204567.55
2017	227672.45
2018	189951.35
2019	233889.41
2020	216838.21
2021	230279.5