Year Tonnes 1950 286026 1951 579386 1952 880080 1953 1184441 1954 1672152 1955 2262539 1956 2951935 1957 3714671 1958 4851441 1959 6197230 1960 7491681 1961 8885141 1962 10857987 1963 12460466 1964 14506652 1965 16464830 1966 18419341 1967 20571870 1968 23054429 1969 25738673 1970 28587932 1971 31624208 1972 34906173 1973 38386156 1974 42137497 1975 46204200 1976 50608267 1977 55580719 1978 61363578 1979 67663484 1980 74542776 1981 81187380 1982 87949328 1983 94945964 1984 101396217 1985 110424371 1986 120097917 1987 130684546 1988 142279600 1989 152847894 1990 162836802 1991 174996574 1992 186015909 1993 195300753 1994 203247142 1995 211167862 1996 219209593 1997 226917627 1998 234625661 1999 242179681 2000 249686030 2001 257570080 2002 265857500 2003 273891897 2004 282443341 2005 291005786 2006 300400640 2007 312465070 2008 324503831 2009 337606022 2010 351426945 2011 372926566 2012 399152950 2013 437905806 2014 458745367