Year Tonnes
1868 11.001
1869 18.335
1870 18.335
1871 25.669
1872 33.003
1873 40.337
1874 586.72
1875 1441.131
1876 1404.461
1877 1290.784
1878 1859.169
1879 2317.544
1880 2350.547
1881 2416.553
1882 2515.562
1883 2713.58
1884 2959.269
1885 3351.638
1886 3608.328
1887 4477.407
1888 5174.137
1889 6259.569
1890 6761.948
1891 8129.739
1892 8082.068
1893 8580.78
1894 11034.003
1895 12236.779
1896 12926.175
1897 13553.232
1898 17260.569
1899 17286.238
1900 19427.766
1901 23292.784
1902 24964.936
1903 25808.346
1904 29075.643
1905 29955.723
1906 32881.989
1907 35100.524
1908 37663.757
1909 38287.147
1910 39416.583
1911 44246.022
1912 49321.15
1913 54359.608
1914 58063.278
1915 52885.474
1916 58646.331
1917 67538.806
1918 71601.842
1919 79258.538
1920 74341.091
1921 66864.078
1922 71488.165
1923 75969.239
1924 79412.552
1925 82078.461
1926 82672.515
1927 89555.474
1928 92481.74
1929 94975.3
1930 86251.507
1931 77982.422
1932 78059.429
1933 91436.645
1934 101304.542
1935 106493.347
1936 116969.966
1937 125558.08
1938 131865.32
1939 127871.957
1940 153386.943
1941 154754.734
1942 147930.447
1943 150776.039
1944 138858.289
1945 76702.639
1946 52753.462
1947 70094.705
1948 88162.014
1949 98513.955
1950 102642.997
1951 123585.234
1952 130541.533
1953 145924.598
1954 142693.971
1955 142033.911
1956 160819.952
1957 188282.115
1958 181369.82
1959 192847.53
1960 232781.16
1961 283118.069
1962 293220.654
1963 325222.563
1964 359318.329
1965 386919.838
1966 419743.155
1967 489881.864
1968 562565.471
1969 653958.112
1970 768823.22
1971 797543.164
1972 853373.239
1973 915748.909
1974 915873.587
1975 870072.757
1976 908902.62
1977 935213.345
1978 903886.164
1979 955620.2
1980 947571.135
1981 929606.502
1982 900200.829
1983 883838.675
1984 940130.792
1985 915396.877
1986 915334.538
1987 905734.332
1988 989081.575
1989 1025549.89
1990 1096179.977
1991 1099381.268
1992 1123847.492
1993 1109887.223
1994 1173315.322
1995 1183447.243
1996 1204690.174
1997 1200788.486
1998 1157829.581
1999 1196516.431
2000 1220527.947
2001 1203377.388
2002 1220047.57
2003 1242093.574
2004 1266009.748
2005 1239255.316
2006 1231495.944
2007 1252229.162
2008 1210135.669
2009 1103869.676
2010 1171624.835
2011 1191074.603
2012 1230168.49
2013 1246515.976
2014 1214048.358