Year	Tonnes
1928	11001
1929	29336
1930	66006
1931	102676
1932	128345
1933	154014
1934	190684
1935	227354
1936	278692
1937	337364
1938	414371
1939	495045
1992	14638664
1993	26655423
1994	37568415
1995	47010940
1996	56160105
1997	64616207
1998	72679940
1999	79460223
2000	85811467
2001	92797102
2002	99709397
2003	107080067
2004	114483740
2005	121990089
2006	130002484
2007	138319240
2008	146221625
2009	153452949
2010	161527683
2011	168821346
2012	175883988
2013	182964965
2014	189939599