Year	metric tons
1960	13000
1961	12000
1962	12000
1963	12000
1964	12000
1965	19600
1966	22400
1967	25100
1968	23700
1969	32300
1970	37273
1971	35176
1972	32268
1973	35706
1974	37258
1975	28325
1976	34634
1977	29636
1978	31769
1979	31175
1980	38624
1981	40916
1982	37838
1983	44110
1984	56081
1985	62076
1986	59964
1987	58502
1988	72589
1989	72065
1990	80225
1991	81523
1992	82392
1993	90156
1994	104242
1995	104754
1996	105848
1997	108312
1998	118285
1999	124217
2000	119373
2001	127636
2002	163770
2003	156132
2004	158528
2005	186274
2006	185811
2007	144511
2008	133839
2009	117061
2010	122804
2011	120835
2012	120000
2013	129841
2014	128683
2015	127352
2016	129191