Year Tonnes
1878 355.699
1879 506.046
1880 656.393
1881 737.067
1882 828.742
1883 927.751
1884 1059.763
1885 1129.436
1886 1180.774
1887 1239.446
1888 1364.124
1889 1312.786
1890 1422.796
1891 1492.469
1892 1503.47
1893 1543.807
1894 1609.813
1895 1624.481
1896 1771.161
1897 1877.504
1898 2024.184
1899 2178.198
1900 2442.222
1901 2742.916
1902 3043.61
1903 3171.955
1904 3435.979
1905 3542.322
1906 3865.018
1907 4088.705
1908 4154.711
1909 4268.388
1910 4906.446
1911 4613.086
1912 4866.109
1913 4217.05
1914 5086.129
1915 4935.782
1916 5042.125
1917 4620.42
1918 4547.08
1919 4132.709
1920 3560.657
1921 3501.985
1922 3564.324
1923 3839.349
1924 3993.363
1925 4092.372
1926 4275.722
1927 4499.409
1928 4719.429
1929 4899.112
1930 4869.776
1931 4242.719
1932 3542.322
1933 3549.656
1934 3986.029
1935 4154.711
1936 4180.38
1937 4385.732
1938 4250.053
1939 4466.406
1940 4763.433
1941 5005.455
1942 5100.797
1943 5375.822
1944 5474.831
1945 5625.178
1946 5537.17
1947 5456.496
1948 5507.834
1949 5614.177
1950 8577.113
1951 8177.41
1952 9328.848
1953 8558.778
1954 9075.825
1955 9402.188
1956 9684.547
1957 10315.271
1958 10190.593
1959 10329.939
1960 11543.716
1961 11767.403
1962 11210.019
1963 12229.445
1964 13105.858
1965 13699.912
1966 14015.274
1967 13641.24
1968 13487.226
1969 14271.964
1970 14194.957
1971 15060.369
1972 16197.139
1973 18202.988
1974 18756.705
1975 18261.66
1976 19237.082
1977 20300.512
1978 18008.637
1979 16475.831
1980 17458.587
1981 16527.169
1982 18239.658
1983 17964.633
1984 19295.754
1985 21803.982
1986 22893.081
1987 24110.525
1988 25397.642
1989 25404.976
1990 23545.807
1991 24084.856
1992 25082.28
1993 26688.426
1994 26681.092
1995 27132.133
1996 28642.937
1997 31022.82
1998 30029.063
1999 32639.967
2000 32980.998
2001 34447.798
2002 33201.018
2003 34081.098
2004 34554.141
2005 34139.77
2006 33446.707
2007 33637.391
2008 34202.109
2009 32386.944
2010 31781.889
2011 31503.197
2012 34150.771
2013 33457.708
2014 34664.151