Year Tonnes 1941 77007 1942 161348 1943 245689 1944 333697 1945 443707 1946 612389 1947 803073 1948 986423 1949 1169773 1950 6780283 1951 13256205 1952 19545110 1953 25742340 1954 31697548 1955 38481498 1956 44330363 1957 58209958 1958 76222262 1959 91902354 1960 105602266 1961 117784040 1962 131953328 1963 144993180 1964 159287146 1965 173896474 1966 189081521 1967 204831286 1968 220867077 1969 238127646 1970 256800010 1971 276407459 1972 297206683 1973 319604719 1974 342516135 1975 369582262 1976 396806070 1977 426208076 1978 456897199 1979 488609415 1980 520009936 1981 552759913 1982 587314054 1983 618157191 1984 650760488 1985 683338116 1986 716905834 1987 750858587 1988 786494493 1989 822233075 1990 855577106 1991 885287140 1992 916581318 1993 945961322 1994 978208920 1995 1003918257 1996 1030914711 1997 1055564285 1998 1080063512 1999 1105395148 2000 1131478519 2001 1156931166 2002 1183021871 2003 1208507521 2004 1233512794 2005 1259519158 2006 1286926316 2007 1313721085 2008 1344164519 2009 1374061570 2010 1412436725 2011 1448424663 2012 1484581283 2013 1519381113 2014 1554217613