Year Tonnes
1870 22.002
1871 36.67
1872 520.714
1873 726.066
1874 531.715
1875 1169.773
1876 1147.771
1877 671.061
1878 641.725
1879 707.731
1880 880.08
1881 891.081
1882 1085.432
1883 1140.437
1884 1202.776
1885 1114.768
1886 1232.112
1887 1268.782
1888 1367.791
1889 1573.143
1890 1679.486
1891 1741.825
1892 1694.154
1893 1514.471
1894 1778.495
1895 1697.821
1896 1730.824
1897 1818.832
1898 2082.856
1899 2145.195
1900 2467.891
1901 2390.884
1902 2621.905
1903 2522.896
1904 2581.568
1905 2522.896
1906 2900.597
1907 3164.621
1908 3146.286
1909 3197.624
1910 3252.629
1911 3146.286
1912 3655.999
1913 3861.351
1914 3377.307
1915 3087.614
1916 2992.272
1917 1657.484
1918 1096.433
1919 2159.863
1920 2104.858
1921 2148.862
1922 2962.936
1923 2680.577
1924 3032.609
1925 3124.284
1926 3138.952
1927 3633.997
1928 3997.03
1929 3971.361
1930 4327.06
1931 3923.69
1932 3391.975
1933 4000.697
1934 4099.706
1935 4382.065
1936 4132.709
1937 4935.782
1938 4121.708
1939 4756.099
1940 3901.688
1941 3784.344
1942 3028.942
1943 2944.601
1944 3248.962
1945 3340.637
1946 3894.354
1947 5548.171
1948 5258.478
1949 5526.169
1950 5625.178
1951 5401.491
1952 5357.487
1953 5936.873
1954 5797.527
1955 6468.588
1956 7172.652
1957 7792.375
1958 7565.021
1959 7990.393
1960 8225.081
1961 9090.493
1962 9303.179
1963 10025.578
1964 11023.002
1965 11598.721
1966 11851.744
1967 12409.128
1968 13010.516
1969 14612.995
1970 15258.387
1971 16406.158
1972 18349.668
1973 20003.485
1974 20714.883
1975 21356.608
1976 22423.705
1977 22728.066
1978 22742.734
1979 25030.942
1980 26985.453
1981 27227.475
1982 29255.326
1983 30179.41
1984 29064.642
1985 27407.158
1986 30520.441
1987 31536.2
1988 32925.993
1989 41209.746
1990 42320.847
1991 43992.999
1992 48279.722
1993 46926.599
1994 47659.999
1995 51869.715
1996 50586.265
1997 53072.491
1998 57817.589
1999 64425.523
2000 62731.369
2001 62757.038
2002 66790.738
2003 61216.898
2004 63145.74
2005 65279.934
2006 59816.104
2007 60149.801
2008 55624.723
2009 54176.258
2010 48136.709
2011 47623.329
2012 46013.516
2013 45426.796
2014 45052.762