Year Tonnes
1896 3.667
1897 51.338
1898 113.677
1899 80.674
1900 110.01
1901 176.016
1902 256.69
1903 216.353
1904 220.02
1905 253.023
1906 275.025
1907 359.366
1908 410.704
1909 487.711
1910 616.056
1911 678.395
1912 740.734
1913 854.411
1914 920.417
1915 1015.759
1916 1386.126
1917 1800.497
1918 2145.195
1919 2911.598
1920 3047.277
1921 2757.584
1922 3575.325
1923 3835.682
1924 3997.03
1925 4492.075
1926 4756.099
1927 4932.115
1928 4206.049
1929 4195.048
1930 4246.386
1931 3777.01
1932 3597.327
1933 4198.715
1934 4176.713
1935 4367.397
1936 4737.764
1937 5254.811
1938 5903.87
1939 7187.32
1940 7774.04
1941 7942.722
1942 6424.584
1943 6431.918
1944 4635.088
1945 2189.199
1946 2863.927
1947 3622.996
1948 4543.413
1949 4477.407
1950 3788.011
1951 4913.78
1952 6398.915
1953 6479.589
1954 6494.257
1955 7205.655
1956 7693.366
1957 8192.078
1958 9581.871
1959 11004.667
1960 11888.414
1961 12544.807
1962 14183.956
1963 15130.042
1964 16930.539
1965 17869.291
1966 19490.105
1967 22002
1968 24176.531
1969 26329.06
1970 28774.949
1971 31521.532
1972 35925.599
1973 40303.997
1974 39368.912
1975 43519.956
1976 56185.774
1977 61227.899
1978 71139.8
1979 75884.898
1980 83651.604
1981 75184.501
1982 75514.531
1983 83281.237
1984 85008.394
1985 84880.049
1986 94491.256
1987 98352.607
1988 113280.964
1989 123328.544
1990 123687.91
1991 134886.928
1992 145451.555
1993 157174.954
1994 164061.58
1995 174347.515
1996 182506.59
1997 196488.861
1998 199873.502
1999 207126.828
2000 219040.911
2001 228157.073
2002 237841.62
2003 246565.413
2004 260617.357
2005 259388.912
2006 267107.947
2007 277914.596
2008 261592.779
2009 248516.257
2010 269997.543
2011 269179.802
2012 258131.131
2013 260437.674
2014 264071.671