Year Tonnes
1902 0
1903 0
1905 0
1906 3.667
1907 0
1908 0
1909 0
1910 0
1911 135.679
1912 253.023
1913 854.411
1914 1173.44
1915 1404.461
1916 2009.516
1917 2801.588
1918 3450.647
1919 4323.393
1920 5441.828
1921 7260.66
1922 9233.506
1923 11587.72
1924 13516.562
1925 14213.292
1926 15071.37
1927 16714.186
1928 17693.275
1929 17036.882
1930 18529.351
1931 17938.964
1932 20106.161
1933 22104.676
1934 23512.804
1935 23358.79
1936 25573.658
1937 31715.883
1938 31803.891
1939 30076.734
1940 27150.468
1941 20839.561
1942 29556.02
1943 30480.104
1944 41693.79
1945 52940.479
1946 60281.813
1947 63519.774
1948 78015.425
1949 84102.645
1950 0
1951 6919.629
1952 4096.039
1953 3832.015
1954 1045.095
1955 15826.772
1956 22827.075
1957 21818.65
1958 25250.962
1959 25591.993
1960 37392.399
1961 36541.655
1962 37462.072
1963 41341.758
1964 47560.99
1965 53765.554
1966 64161.499
1967 67942.176
1968 82404.824
1969 83116.222
1970 91873.018
1971 101722.58
1972 106115.646
1973 129595.447
1974 143911.415
1975 139349.667
1976 156643.239
1977 163969.905
1978 162470.102
1979 164028.577
1980 120900.99
1981 112899.596
1982 138007.545
1983 149785.949
1984 150658.695
1985 160768.614
1986 148399.823
1987 159573.172
1988 176115.009
1989 191204.714
1990 210463.798
1991 227401.671
1992 228468.768
1993 237214.563
1994 265230.443
1995 272942.144
1996 276059.094
1997 269293.479
1998 308508.377
1999 382339.755
2000 372237.17
2001 398437.885
2002 401760.187
2003 418437.703
2004 447036.636
2005 468807.615
2006 509338.966
2007 519324.207
2008 541582.897
2009 554278.051
2010 573031.089
2011 589055.879
2012 611758.276
2013 619778.005
2014 649480.705