Year Tonnes 1928 3667 1929 14668 1930 25669 1931 33003 1932 47671 1933 91675 1934 165015 1935 234688 1936 278692 1937 333697 1938 399703 1939 484044 1940 612389 1941 718732 1942 854411 1943 1001091 1944 1140437 1945 1309119 1946 1470467 1947 1639149 1948 1844501 1949 2134194 1950 2629239 1951 3091281 1952 3604661 1953 4143710 1954 4932115 1955 5863533 1956 6970967 1957 7975725 1958 8892475 1959 9842228 1960 10846986 1961 11888414 1962 12988514 1963 14202291 1964 15683759 1965 17194563 1966 18885050 1967 20777222 1968 22955420 1969 25503985 1970 27990211 1971 31052156 1972 34623814 1973 38081795 1974 41598448 1975 45657817 1976 50237900 1977 54718974 1978 59746431 1979 64484195 1980 69152286 1981 73945055 1982 78294117 1983 82584507 1984 86625541 1985 90750916 1986 94527926 1987 98557959 1988 102866684 1989 107861138 1990 113618328 1991 119624874 1992 126280479 1993 134109524 1994 142745309 1995 152594871 1996 162422431 1997 173364759 1998 184354758 1999 194798374 2000 205865380 2001 214486497 2002 224882442 2003 235975117 2004 247089794 2005 259275235 2006 274331937 2007 286664058 2008 299901928 2009 313891533 2010 329094915 2011 345240716 2012 364034091 2013 382952144 2014 403362666