Year Tonnes 1950 121011 1951 253023 1952 410704 1953 579386 1954 737067 1955 909416 1956 1103767 1957 1268782 1958 1444798 1959 1642816 1960 1837167 1961 2005849 1962 2236870 1963 2478892 1964 2904264 1965 3248962 1966 3571658 1967 3927357 1968 4323393 1969 4756099 1970 5276813 1971 5826863 1972 6406249 1973 7036973 1974 7708034 1975 8331424 1976 8815468 1977 9581871 1978 10293269 1979 11133012 1980 11928751 1981 13010516 1982 13850259 1983 14565324 1984 15148377 1985 15727763 1986 16332818 1987 16809528 1988 17363245 1989 17993969 1990 18808043 1991 19479104 1992 20227172 1993 20978907 1994 21726975 1995 22489711 1996 23311119 1997 24103191 1998 24873261 1999 25657999 2000 26501409 2001 27557505 2002 28448586 2003 29497348 2004 30850471 2005 31946904 2006 33164348 2007 34323120 2008 35217868 2009 36009940 2010 37231051 2011 38320150 2012 39379913 2013 40531351 2014 41701124