Year Tonnes
1889 3.667
1890 14.668
1891 22.002
1892 179.683
1893 403.37
1894 480.377
1895 770.07
1896 861.745
1897 1107.434
1898 1290.784
1899 1125.769
1900 1210.11
1901 2244.204
1902 1540.14
1903 3003.273
1904 3369.973
1905 4136.376
1906 4455.405
1907 5298.815
1908 5496.833
1909 5991.878
1910 6116.556
1911 6732.612
1912 5845.198
1913 5903.87
1914 6021.214
1915 6035.882
1916 6769.282
1917 7143.316
1918 7135.982
1919 7642.028
1920 8269.085
1921 8764.13
1922 8305.755
1923 9596.539
1924 10593.963
1925 11089.008
1926 11107.343
1927 12896.839
1928 14844.016
1929 18555.02
1930 18100.312
1931 16908.537
1932 16600.509
1933 17876.625
1934 19251.75
1935 20018.153
1936 21785.647
1937 25364.639
1938 26754.432
1939 29225.99
1940 28756.614
1941 26508.743
1942 9464.527
1943 19042.731
1944 8778.798
1945 3810.013
1946 1345.789
1947 4059.369
1948 15507.743
1949 21921.326
1950 9838.561
1951 9398.521
1952 12731.824
1953 13091.19
1954 14759.675
1955 20861.563
1956 21829.651
1957 22431.039
1958 22225.687
1959 23883.171
1960 21404.279
1961 26024.699
1962 22995.757
1963 22783.071
1964 22394.369
1965 24689.911
1966 23395.46
1967 24561.566
1968 27586.841
1969 33391.702
1970 35822.923
1971 38987.544
1972 43340.273
1973 49134.133
1974 51260.993
1975 53963.572
1976 61810.952
1977 82434.16
1978 93933.872
1979 95096.311
1980 94784.616
1981 100160.438
1982 105407.915
1983 104956.874
1984 112184.531
1985 121245.688
1986 121740.733
1987 123372.548
1988 132162.347
1989 130966.905
1990 149565.929
1991 179730.671
1992 202576.081
1993 218600.871
1994 221413.46
1995 224941.114
1996 253290.691
1997 278658.997
1998 214200.471
1999 241988.997
2000 263418.945
2001 294907.474
2002 306737.216
2003 316792.13
2004 337635.358
2005 341991.754
2006 345119.705
2007 375544.804
2008 416560.199
2009 446409.579
2010 428760.308
2011 603665.207
2012 637078.911
2013 490226.562
2014 464176.194