Year Tonnes 1950 7334 1951 18335 1952 29336 1953 40337 1954 55005 1955 69673 1956 84341 1957 99009 1958 117344 1959 139346 1960 161348 1961 183350 1962 205352 1963 231021 1964 260357 1965 297027 1966 341031 1967 410704 1968 495045 1969 579386 1970 682062 1971 784738 1972 887414 1973 1004758 1974 1107434 1975 1224778 1976 1499803 1977 1840834 1978 2170864 1979 2717247 1980 3091281 1981 3417644 1982 3780677 1983 4165712 1984 4521411 1985 4888111 1986 5254811 1987 5672849 1988 6189896 1989 6860957 1990 7491681 1991 8159075 1992 8863139 1993 9563536 1994 10179592 1995 10762645 1996 11250356 1997 11719732 1998 12332121 1999 12797830 2000 13263539 2001 13773252 2002 14231627 2003 14833015 2004 15405067 2005 15958784 2006 16431827 2007 16996545 2008 17553929 2009 18144316 2010 18782374 2011 19424099 2012 20014486 2013 20645210 2014 21378610