Year Tonnes
1891 520.714
1892 579.386
1893 531.715
1894 539.049
1895 495.045
1896 579.386
1897 689.396
1898 737.067
1899 755.402
1900 1001.091
1901 1312.786
1902 1426.463
1903 1558.475
1904 1719.823
1905 1708.822
1906 1921.508
1907 2266.206
1908 3773.343
1909 3696.336
1910 4158.378
1911 8408.431
1912 8639.452
1913 11752.735
1914 10150.256
1915 14326.969
1916 17198.23
1917 26153.044
1918 30667.121
1919 41118.071
1920 76299.269
1921 90362.214
1922 85620.783
1923 72096.887
1924 67927.508
1925 57131.86
1926 44722.732
1927 31822.226
1928 24103.191
1929 22167.015
1930 20395.854
1931 16765.524
1932 16208.14
1933 16754.523
1934 18907.052
1935 21444.616
1936 21979.998
1937 24924.599
1938 24286.541
1939 22684.062
1940 23230.445
1941 22566.718
1942 18995.06
1943 19075.734
1944 20142.831
1945 22636.391
1946 25646.998
1947 29380.004
1948 30538.776
1949 28987.635
1950 30538.776
1951 34924.508
1952 37249.386
1953 36743.34
1954 36306.967
1955 39702.609
1956 42177.834
1957 49328.484
1958 54062.581
1959 58345.637
1960 63116.404
1961 65305.603
1962 63809.467
1963 66361.699
1964 74278.752
1965 75246.84
1966 80930.69
1967 90101.857
1968 93988.877
1969 102287.298
1970 114073.036
1971 126339.151
1972 132459.374
1973 144292.783
1974 155007.757
1975 164472.284
1976 184138.405
1977 192847.53
1978 222649.239
1979 240874.229
1980 268453.736
1981 284529.864
1982 304837.71
1983 278442.644
1984 277624.903
1985 288501.225
1986 294559.109
1987 307356.939
1988 307067.246
1989 361877.895
1990 318427.612
1991 331958.842
1992 334698.091
1993 339468.858
1994 352780.068
1995 332816.92
1996 346417.823
1997 369769.279
1998 389087.035
1999 391591.596
2000 398382.88
2001 412977.54
2002 414389.335
2003 440208.682
2004 441308.782
2005 466361.726
2006 479251.231
2007 480520.013
2008 493251.837
2009 475950.931
2010 464308.206
2011 484429.035
2012 496324.783
2013 490340.239
2014 480270.657