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	1838
1987	2059
1988	2151
1989	1770
1990	2033
1991	2521
1992	2414
1993	3971
1994	7670
1995	9719
1996	12168
1997	24788
1998	26600
1999	51827
2000	30322
2001	30746
2002	84360
2003	43358
2004	70046
2005	100507
2006	185773
2007	305645
2008	364274
2009	304217
2010	399928
2011	277494.29
2012	171943.25
2013	34703.6
2014	76201.19
2015	97524.25
2016	91424.52
2017	121359.06
2018	216956.04
2019	213986.32
2020	186909.89
2021	191504.13
2022	204764.24