Year	Tonnes
1903	113.677
1904	143.013
1905	234.688
1906	253.023
1907	278.692
1908	396.036
1909	410.704
1910	432.706
1911	513.38
1912	520.714
1913	583.053
1914	843.41
1915	986.423
1916	1184.441
1917	1323.787
1918	1180.774
1919	1228.445
1920	1389.793
1921	1386.126
1922	1243.113
1923	1485.135
1924	1569.476
1925	1829.833
1926	2324.878
1927	2412.886
1928	2907.931
1929	2753.917
1930	2493.56
1931	1558.475
1932	1162.439
1933	1283.45
1934	1708.822
1935	1844.501
1936	1870.17
1937	2735.582
1938	2772.252
1939	2970.27
1940	3428.645
1941	3747.674
1942	4143.71
1943	4723.096
1944	4800.103
1945	4466.406
1946	4316.059
1947	4041.034
1948	4539.746
1949	5133.8
1964	4473.74
1965	5214.474
1966	6046.883
1967	5298.815
1968	6384.247
1969	6750.947
1970	8162.742
1971	8742.128
1972	8225.081
1973	9281.177
1974	9057.49
1975	8320.423
1976	10868.988
1977	9299.512
1978	9295.845
1979	9449.859
1980	9636.876
1981	9435.191
1982	8811.801
1983	10461.951
1984	9922.902
1985	10263.933
1986	13127.86
1987	15240.052
1988	16101.797
1989	16186.138
1990	15643.422
1991	15955.117
1992	17011.213
1993	16362.154
1994	17795.951
1995	15130.042
1996	14994.363
1997	14407.643
1998	14253.629
1999	15834.106
2000	13923.599
2001	12596.145
2002	11965.421
2003	10656.302
2004	9486.529
2005	10769.979
2006	10447.283
2007	9886.232
2008	7770.373
2009	5603.176
2010	7777.707
2011	9563.536
2012	7792.375
2013	11675.728
2014	12020.426