Year Tonnes 1928 3160954 1929 6211898 1930 9299512 1931 12236779 1932 15218050 1933 18217656 1934 21283268 1935 24312210 1936 27425493 1937 30645119 1938 33736400 1939 36970694 1940 40146316 1941 43332939 1942 44359699 1943 44770403 1944 45078431 1945 45375458 1946 45382792 1947 45408461 1948 45562475 1949 45665151 1950 46468224 1951 47384974 1952 48518077 1953 49823529 1954 51286662 1955 52709458 1956 54366942 1957 56468133 1958 58881019 1959 61660605 1960 64377852 1961 66970421 1962 69852683 1963 72489256 1964 75349516 1965 78077764 1966 80886686 1967 84506015 1968 87435948 1969 90651907 1970 95268660 1971 100373124 1972 105272236 1973 109382943 1974 114058368 1975 118645785 1976 123544897 1977 128719034 1978 133874836 1979 138975633 1980 144501802 1981 150141648 1982 155741157 1983 161516682 1984 168087946 1985 174798556 1986 181589840 1987 186565959 1988 190684000 1989 195146739 1990 199422461 1991 203602841 1992 208490952 1993 213833771 1994 220078672 1995 227038638 1996 234295631 1997 241794646 1998 249873047 1999 258842529 2000 268930446 2001 277654239 2002 286862076 2003 296707971 2004 309142768 2005 320741489 2006 333590657 2007 346465494 2008 356267385 2009 366498315 2010 379013786 2011 393311419 2012 404382092 2013 417242261 2014 438873894