Year	metric tons
1960	100
1961	114
1962	120
1963	120
1964	80
1965	80
1966	100
1967	150
1968	150
1969	150
1970	540
1971	660
1972	709
1973	1984
1974	1826
1975	2840
1976	2486
1977	2960
1978	4841
1979	6766
1980	8626
1981	11089
1982	12512
1983	13679
1984	10465
1985	11230
1986	13523
1987	15907
1988	17121
1989	18249
1990	22348
1991	24972
1992	26576
1993	28068
1994	31667
1995	25580
1996	31339
1997	39500
1998	41068
1999	48443
2000	53918
2001	76063
2002	73670
2003	84470
2004	104348
2005	133131
2006	154451
2007	140062.25
2008	159309.05
2009	156956.64
2010	126238
2011	137128
2012	143746.64
2013	111499.75
2014	194229.76
2015	211621.64
2016	221327.5
2017	243307.32
2018	247222.42
2019	303646.7
2020	348601.75
2021	239802.71
2022	289618.53