Year	Tonnes
1916	11.001
1917	29.336
1918	40.337
1920	29.336
1921	22.002
1922	0
1923	0
1924	0
1932	0
1933	18.335
1934	18.335
1935	18.335
1936	25.669
1937	29.336
1938	33.003
1939	33.003
1940	58.672
1941	135.679
1942	161.348
1943	51.338
1944	91.675
1945	95.342
1946	132.012
1947	128.345
1948	146.68
1949	128.345
1950	1221.111
1951	1378.792
1952	1444.798
1953	1378.792
1954	1408.128
1955	1598.812
1956	1562.142
1957	1576.81
1958	1448.465
1959	1591.478
1960	1727.157
1961	1767.494
1962	1796.83
1963	1947.177
1964	2757.584
1965	2464.224
1966	2885.929
1967	3087.614
1968	3597.327
1969	3857.684
1970	3744.007
1971	4213.383
1972	4737.764
1973	4829.439
1974	5397.824
1975	5548.171
1976	5848.865
1977	6758.281
1978	7491.681
1979	8771.464
1980	9493.863
1981	9834.894
1982	9526.866
1983	11305.361
1984	11547.383
1985	11939.752
1986	12064.43
1987	11749.068
1988	12464.133
1989	13234.203
1990	13267.206
1991	15489.408
1992	15023.699
1993	16501.5
1994	15940.449
1995	15735.097
1996	16758.19
1997	16945.207
1998	18001.303
1999	18331.333
2000	19922.811
2001	20817.559
2002	20861.563
2003	21246.598
2004	22299.027
2005	22662.06
2006	22992.09
2007	24110.525
2008	24825.59
2009	24788.92
2010	27660.181
2011	26021.032
2012	27003.788
2013	27667.515
2014	28829.954