Year Tonnes 1950 25669 1951 51338 1952 95342 1953 124678 1954 157681 1955 198018 1956 238355 1957 286026 1958 333697 1959 388702 1960 454708 1961 546383 1962 634391 1963 740734 1964 872746 1965 1004758 1966 1184441 1967 1382459 1968 1576810 1969 1818832 1970 2093857 1971 2409219 1972 2808922 1973 3212292 1974 3589993 1975 3901688 1976 4224384 1977 4686426 1978 5042125 1979 6424584 1980 7143316 1981 7770373 1982 8503773 1983 9050156 1984 9658878 1985 10208928 1986 10916659 1987 11683062 1988 12475134 1989 13311210 1990 14084947 1991 14928357 1992 15764433 1993 16629845 1994 17462254 1995 18415674 1996 19475437 1997 20461860 1998 21627966 1999 23164439 2000 24524896 2001 25687335 2002 26919447 2003 28382580 2004 29779707 2005 31118162 2006 32339273 2007 33747401 2008 35430554 2009 38213807 2010 40854047 2011 43318271 2012 45804497 2013 48463072 2014 51084977