Year Tonnes 1950 3667 1951 14668 1952 22002 1953 33003 1954 40337 1955 51338 1956 62339 1957 73340 1958 84341 1959 95342 1960 110010 1961 128345 1962 146680 1963 168682 1964 190684 1965 216353 1966 245689 1967 278692 1968 315362 1969 377701 1970 443707 1971 513380 1972 590387 1973 671061 1974 744401 1975 821408 1976 905749 1977 975422 1978 1074431 1979 1224778 1980 1338455 1981 1433797 1982 1547474 1983 1650150 1984 1763827 1985 1892172 1986 2024184 1987 2170864 1988 2335879 1989 2500894 1990 2662242 1991 2830924 1992 3032609 1993 3256296 1994 3516653 1995 3828348 1996 4154711 1997 4462739 1998 4770767 1999 5089796 2000 5419826 2001 5782859 2002 6109222 2003 6468588 2004 6824287 2005 7190987 2006 7557687 2007 7942722 2008 8338758 2009 8723793 2010 9127163 2011 9534200 2012 9941237 2013 10348274 2014 10755311