Year Tonnes 1950 14668 1951 29336 1952 40337 1953 51338 1954 66006 1955 80674 1956 99009 1957 121011 1958 146680 1959 165015 1960 183350 1961 205352 1962 231021 1963 260357 1964 289693 1965 319029 1966 352032 1967 385035 1968 421705 1969 469376 1970 517047 1971 572052 1972 638058 1973 700397 1974 762736 1975 861745 1976 960754 1977 1074431 1978 1213777 1979 1360457 1980 1518138 1981 1675819 1982 1837167 1983 1998515 1984 2170864 1985 2343213 1986 2504561 1987 2684244 1988 2867594 1989 3047277 1990 3223293 1991 3402976 1992 3582659 1993 3769676 1994 3956693 1995 4154711 1996 4352729 1997 4550747 1998 4763433 1999 4994454 2000 5240143 2001 5493166 2002 5782859 2003 6072552 2004 6365912 2005 6659272 2006 6967300 2007 7319332 2008 7686032 2009 8067400 2010 8500106 2011 8947480 2012 9402188 2013 9834894 2014 10348274