Year Tonnes 1956 3667 1957 7334 1958 14668 1959 22002 1960 33003 1961 44004 1962 55005 1963 66006 1964 77007 1965 88008 1966 106343 1967 121011 1968 143013 1969 187017 1970 223687 1971 267691 1972 322696 1973 381368 1974 436373 1975 491378 1976 557384 1977 627057 1978 718732 1979 810407 1980 971755 1981 1125769 1982 1287117 1983 1455799 1984 1639149 1985 1829833 1986 2031518 1987 2247871 1988 2471558 1989 2728248 1990 2977604 1991 3248962 1992 3560657 1993 3890687 1994 4253720 1995 4616753 1996 5001788 1997 5408825 1998 5837864 1999 6266903 2000 6732612 2001 7201988 2002 7689699 2003 8184744 2004 8646786 2005 9119829 2006 9603873 2007 10175925 2008 10758978 2009 11316362 2010 11873746 2011 12460466 2012 12995848 2013 13531230 2014 14073946