Year Tonnes 1950 40337 1951 80674 1952 135679 1953 220020 1954 297027 1955 396036 1956 509713 1957 605055 1958 722399 1959 821408 1960 880080 1961 993757 1962 1111101 1963 1235779 1964 1356790 1965 1492469 1966 1631815 1967 1800497 1968 1983847 1969 2196533 1970 2453223 1971 2713580 1972 2948268 1973 3201291 1974 3501985 1975 3850350 1976 4180380 1977 4587417 1978 4987120 1979 5467497 1980 5889202 1981 6329242 1982 6787617 1983 7275328 1984 7774040 1985 8291087 1986 8782465 1987 9281177 1988 9809225 1989 10388611 1990 11100009 1991 11767403 1992 12416462 1993 12999515 1994 13575234 1995 14147286 1996 14748674 1997 15339061 1998 15962451 1999 16593175 2000 17282571 2001 18045307 2002 18771373 2003 19504773 2004 20252841 2005 20975240 2006 21653635 2007 22343031 2008 22973755 2009 23549474 2010 24180198 2011 24748583 2012 25338970 2013 26017365 2014 26615086