Year Tonnes
1895 524.381
1896 535.382
1897 638.058
1898 740.734
1899 634.391
1900 850.744
1901 1569.476
1902 1961.845
1903 2163.53
1904 1969.179
1905 2079.189
1906 2442.222
1907 2181.865
1908 2460.557
1909 2354.214
1910 2812.589
1911 3109.616
1912 3465.315
1913 3358.972
1914 2845.592
1915 3069.279
1916 3711.004
1917 4030.033
1918 3971.361
1919 3887.02
1920 2783.253
1921 3336.97
1922 2757.584
1923 3047.277
1924 4030.033
1925 3802.679
1926 3905.355
1927 3879.686
1928 3659.666
1929 4019.032
1930 3854.017
1931 2929.933
1932 2896.93
1933 4096.039
1934 4833.106
1935 5115.465
1936 5031.124
1937 5284.147
1938 5533.503
1939 5012.789
1940 5265.812
1941 5573.84
1942 5812.195
1943 6116.556
1944 6145.892
1945 5647.18
1946 5438.161
1947 5713.186
1948 6215.565
1949 5881.868
1950 8459.769
1951 9992.575
1952 10615.965
1953 10414.28
1954 11092.675
1955 11609.722
1956 11844.41
1957 11738.067
1958 12464.133
1959 12717.156
1960 13490.893
1961 14473.649
1962 16725.187
1963 17355.911
1964 17524.593
1965 17766.615
1966 18793.375
1967 19259.084
1968 21224.596
1969 22555.717
1970 24664.242
1971 27095.463
1972 28191.896
1973 27652.847
1974 25955.026
1975 23014.092
1976 24103.191
1977 23109.434
1978 22948.086
1979 24862.26
1980 25265.63
1981 24554.232
1982 20615.874
1983 20839.561
1984 22200.018
1985 21503.288
1986 22247.689
1987 22673.061
1988 26926.781
1989 32386.944
1990 33314.695
1991 31323.514
1992 32474.952
1993 34627.481
1994 38103.797
1995 41745.128
1996 48499.742
1997 56394.793
1998 57641.573
1999 61502.924
2000 58815.013
2001 53340.182
2002 55162.681
2003 55602.721
2004 59775.767
2005 61818.286
2006 64814.225
2007 71638.512
2008 71851.198
2009 66805.406
2010 72250.901
2011 79243.87
2012 80974.694
2013 83226.232
2014 82562.505