Year	metric tons
1960	900
1961	600
1962	800
1963	900
1964	900
1965	800
1966	900
1967	1300
1968	1300
1969	1600
1970	1500
1971	1800
1972	1900
1973	1600
1974	1618
1975	1603
1976	1613
1977	3082
1978	2808
1979	2554
1980	2066
1981	2252
1982	2288
1983	2641
1984	2672
1985	2427
1986	1861
1987	2059
1988	2151
1989	2312
1990	2132
1991	2679
1992	2715
1993	4573
1994	8326
1995	10669
1996	13172
1997	26185
1998	28242
1999	54990
2000	33952
2001	35206
2002	88760
2003	53518
2004	81472
2005	111585
2006	193397
2007	308817
2008	368802
2009	309942
2010	407338.7
2011	282596.29
2012	177826.45
2013	41863.6
2014	83416.15000000001
2015	101730.25
2016	92575.52
2017	121924.06
2018	217532.04
2019	214565.32
2020	187468.89
2021	192113.13
2022	205894.24