Year	Tonnes
1931	29336
1932	55005
1933	77007
1934	102676
1935	128345
1936	157681
1937	194351
1938	234688
1939	282359
1940	341031
1941	399703
1943	432706
1944	447374
1947	476710
1948	517047
1949	579386
1950	1536473
1951	2629239
1952	3909022
1953	5555505
1954	7609025
1955	9985241
1956	12607146
1957	15533412
1958	18555020
1959	21880989
1960	25595660
1961	29743037
1962	34777828
1963	40348001
1964	47828681
1965	55280025
1966	64759220
1967	76926326
1968	94025547
1969	108587204
1970	123962935
1971	143211018
1972	165048003
1973	189503226
1974	213749430
1975	238156982
1976	266935598
1977	299095188
1978	334162709
1979	370898715
1980	411034030
1981	449082822
1982	486992268
1983	529445127
1984	575418306
1985	624090397
1986	673792915
1987	730737758
1988	797741182
1989	876633020
1990	967438941
1991	1067221678
1992	1177000657
1993	1301950015
1994	1441108998
1995	1602262647
1996	1782517699
1997	1968434599
1998	2132782205
1999	2308908215
2000	2490179026
2001	2684779382
2002	2893101652
2003	3117676066
2004	3360864172
2005	3608331667
2006	3860379245
2007	4112826526
2008	4365270140
2009	4632873132
2010	4914799426
2011	5193117392
2012	5489715353
2013	5789804298
2014	6106017042