Year Tonnes
1908 0
1909 25669
1910 91675
1911 216353
1912 414371
1913 638058
1914 927751
1915 1261448
1916 1675819
1917 2203867
1918 2973937
1919 3622996
1920 4492075
1921 5493166
1922 6475922
1923 7686032
1924 9343516
1925 11290693
1926 13252538
1927 15353729
1928 18588023
1929 22185350
1930 25834015
1931 28910628
1932 32166924
1933 36237294
1934 41019062
1935 46112525
1936 51858714
1937 59112040
1938 67458132
1939 76918992
1940 87663302
1941 97571536
1942 108246173
1943 118528441
1944 129309421
1945 140339757
1946 151285752
1947 163298844
1948 175949994
1949 189712245
1950 192066459
1951 194582021
1952 197379942
1953 200317209
1954 203155467
1955 205880048
1956 208762310
1957 211329210
1958 214809193
1959 217904141
1960 220485709
1961 225087794
1962 232326452
1963 233635571
1964 237430916
1965 242627055
1966 246682757
1967 251321512
1968 255362546
1969 259267901
1970 268266719
1971 276370789
1972 284614205
1973 294012726
1974 304063973
1975 313686181
1976 329611962
1977 345787099
1978 361115159
1979 377840346
1980 394778219
1981 412038788
1982 430465463
1983 446768945
1984 464304539
1985 485059759
1986 502445006
1987 519965932
1988 535833041
1989 551975175
1990 569001056
1991 586015936
1992 605168677
1993 623140644
1994 640580896
1995 657603110
1996 678193315
1997 696586987
1998 715710392
1999 738255108
2000 762094275
2001 788449004
2002 817069939
2003 849057180
2004 882489219
2005 920640687
2006 963317233
2007 1008791700
2008 1053177068
2009 1098072149
2010 1146007173
2011 1192941106
2012 1238360568
2013 1284902132
2014 1331176005