Year Tonnes 1950 47671 1951 95342 1952 143013 1953 190684 1954 238355 1955 304361 1956 374034 1957 447374 1958 531715 1959 619723 1960 704064 1961 792072 1962 898415 1963 1001091 1964 1136770 1965 1268782 1966 1408128 1967 1635482 1968 1789496 1969 1950844 1970 2167197 1971 2354214 1972 2588902 1973 2852926 1974 3182956 1975 3685335 1976 4165712 1977 4965118 1978 5522502 1979 6010213 1980 6824287 1981 7099312 1982 7818044 1983 8753129 1984 9468194 1985 10326272 1986 11250356 1987 12244113 1988 13252538 1989 14209625 1990 14943025 1991 15650756 1992 16332818 1993 16974543 1994 17605267 1995 18195654 1996 18764039 1997 19303088 1998 19816468 1999 20307846 2000 20788223 2001 21290602 2002 21877322 2003 22471376 2004 23065430 2005 23659484 2006 24253538 2007 24862260 2008 25463648 2009 26061369 2010 26673758 2011 27278813 2012 27887535 2013 28496257 2014 29104979