Year Tonnes 1936 22002 1937 40337 1940 73340 1941 99009 1943 117344 1944 135679 1945 150347 1946 161348 1947 165015 1948 168682 1949 172349 1950 913083 1951 1558475 1952 2335879 1953 3252629 1954 4033700 1955 4946783 1956 5896536 1957 6860957 1958 7953723 1959 9193169 1960 10406946 1961 11499712 1962 12698821 1963 14004273 1964 15313392 1965 16710519 1966 18206655 1967 19651453 1968 21246598 1969 22511713 1970 23901506 1971 25375640 1972 26860775 1973 28613601 1974 30355426 1975 31972573 1976 33677728 1977 35584568 1978 37509743 1979 39497257 1980 41363760 1981 43116586 1982 44715398 1983 46262872 1984 48078037 1985 49706185 1986 51492014 1987 53343849 1988 55192017 1989 57095190 1990 59093705 1991 60861199 1992 62680031 1993 64656544 1994 66666060 1995 68613237 1996 70824438 1997 72929296 1998 75030487 1999 77098675 2000 79262205 2001 81363396 2002 83534260 2003 85701457 2004 87945661 2005 90175197 2006 92474406 2007 94784616 2008 96904142 2009 98957662 2010 100919507 2011 102800678 2012 104601175 2013 106500681 2014 108484528