Year	Tonnes
1935	0
1936	7.334
1937	25.669
1938	205.352
1939	1653.817
1940	2148.862
1941	1811.498
1942	1903.173
1943	1994.848
1944	3263.63
1945	8819.135
1946	25173.955
1947	37762.766
1948	17957.299
1949	18401.006
1950	5144.801
1951	0
1952	0
1953	476.71
1954	1239.446
1955	2115.859
1956	1631.815
1957	2101.191
1958	3362.639
1959	1855.502
1960	2676.91
1961	3571.658
1962	6255.902
1963	6945.298
1964	7047.974
1965	4220.717
1966	6413.583
1967	25507.652
1968	29104.979
1969	35302.209
1970	45291.117
1971	59808.77
1972	70344.061
1973	95136.648
1974	98788.98
1975	83336.242
1976	101550.231
1977	118176.409
1978	115132.799
1979	138135.89
1980	169404.399
1981	175491.619
1982	158091.704
1983	161050.973
1984	155715.488
1985	172653.361
1986	204878.957
1987	190706.002
1988	202554.079
1989	203738.52
1990	185803.223
1991	267768.007
1992	285534.622
1993	313818.193
1994	307961.994
1995	235161.043
1996	258750.854
1997	216239.323
1998	207680.545
1999	226459.252
2000	296935.325
2001	297214.017
2002	326407.004
2003	327272.416
2004	395834.315
2005	397642.146
2006	432739.003
2007	387777.916
2008	430175.77
2009	468965.296
2010	518491.798
2011	499878.106
2012	564842.678
2013	541047.515
2014	601046.969