Year Tonnes 1952 3667 1953 7334 1954 11001 1955 22002 1956 33003 1957 44004 1958 55005 1959 66006 1960 77007 1961 91675 1962 106343 1963 121011 1964 139346 1965 165015 1966 190684 1967 223687 1968 260357 1969 297027 1970 337364 1971 385035 1972 440040 1973 506046 1974 572052 1975 630724 1976 693063 1977 773737 1978 836076 1979 946086 1980 1048762 1981 1184441 1982 1305452 1983 1448465 1984 1591478 1985 1741825 1986 1895839 1987 2057187 1988 2214868 1989 2376216 1990 2522896 1991 2669576 1992 2812589 1993 2955602 1994 3094948 1995 3237961 1996 3380974 1997 3523987 1998 3667000 1999 3817347 2000 3967694 2001 4125375 2002 4283056 2003 4444404 2004 4605752 2005 4767100 2006 4932115 2007 5111798 2008 5298815 2009 5493166 2010 5691184 2011 5889202 2012 6087220 2013 6288905 2014 6490590